diff --git a/types/iost-contract/base.d.ts b/types/iost-contract/base.d.ts
new file mode 100755
index 0000000000..0e8eb94129
--- /dev/null
+++ b/types/iost-contract/base.d.ts
@@ -0,0 +1,6 @@
+// base definnitions for all IOST contract modules that are not specific to any version of TypeScript
+/// <reference path="block.d.ts" />
+/// <reference path="blockchain.d.ts" />
+/// <reference path="iostcrypto.d.ts" />
+/// <reference path="storage.d.ts" />
+/// <reference path="tx.d.ts" />
diff --git a/types/iost-contract/block.d.ts b/types/iost-contract/block.d.ts
new file mode 100755
index 0000000000..b5f24c2f60
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+++ b/types/iost-contract/block.d.ts
@@ -0,0 +1,10 @@
+declare namespace IOSTContract {
+    interface Block {
+        number: number;
+        parent_hash: string;
+        witness: string;
+        time: number;
+    }
+}
+
+declare const block: IOSTContract.Block;
diff --git a/types/iost-contract/blockchain.d.ts b/types/iost-contract/blockchain.d.ts
new file mode 100755
index 0000000000..b0f1b6c5a2
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+++ b/types/iost-contract/blockchain.d.ts
@@ -0,0 +1,17 @@
+declare namespace IOSTContract {
+    interface Blockchain {
+        transfer(from: string, to: string, amount: string, memo: string): void;
+        withdraw(to: string, amount: string, memo: string): void;
+        deposit(from: string, amount: string, memo: string): void;
+        contractName(): string;
+        publisher(): string;
+        contractOwner(): string;
+        call(contract: string, abi: string, args: string[] | string): string[];
+        callWithAuth(contract: string, abi: string, args: string[] | string): string[];
+        requireAuth(account: string, permission: string): boolean;
+        receipt(data: string): void;
+        event(data: string): void;
+    }
+}
+
+declare const blockchain: IOSTContract.Blockchain;
diff --git a/types/iost-contract/index.d.ts b/types/iost-contract/index.d.ts
new file mode 100755
index 0000000000..acc7e95ef5
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+++ b/types/iost-contract/index.d.ts
@@ -0,0 +1,8 @@
+// Type definitions for non-npm package IOST contract API 3.4
+// Project: https://github.com/iost-official/
+// Definitions by: Masaki Muranaka <https://github.com/monaka>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+// TypeScript Version: 2.2
+
+/// <reference path="base.d.ts" />
diff --git a/types/iost-contract/iost-contract-tests.ts b/types/iost-contract/iost-contract-tests.ts
new file mode 100755
index 0000000000..7fa105fa8e
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+++ b/types/iost-contract/iost-contract-tests.ts
@@ -0,0 +1,11 @@
+// $ExpectType number
+block.number;
+
+// $ExpectType string
+block.parent_hash;
+
+// $ExpectType number
+block.time;
+
+// $ExpectType string
+block.witness;
diff --git a/types/iost-contract/iostcrypto.d.ts b/types/iost-contract/iostcrypto.d.ts
new file mode 100755
index 0000000000..9484f1f54b
--- /dev/null
+++ b/types/iost-contract/iostcrypto.d.ts
@@ -0,0 +1,15 @@
+declare namespace IOSTContract {
+    interface Block {
+        number: number;
+        parent_hash: string;
+        witness: string;
+        time: number;
+    }
+
+    interface _IOSTCrypto {
+        sha3(data: string): string;
+        verify(algo: string, message: string, signature: string, pubkey: string): number;
+    }
+}
+
+declare const IOSTCrypto: IOSTContract._IOSTCrypto;
diff --git a/types/iost-contract/storage.d.ts b/types/iost-contract/storage.d.ts
new file mode 100755
index 0000000000..3d9e344376
--- /dev/null
+++ b/types/iost-contract/storage.d.ts
@@ -0,0 +1,26 @@
+declare namespace IOSTContract {
+    interface LocalStorage {
+        put(key: string, value: string, payer?: string): any;
+        get(key: string): string | null;
+        has(key: string): boolean;
+        del(key: string): void;
+        mapPut(key: string, field: string, value: string, payer?: string): void;
+        mapGet(key: string, field: string): string | null;
+        mapHas(key: string, field: string): boolean;
+        mapKeys(key: string): string[];
+        mapLen(key: string): number;
+        mapDel(key: string, field: string): void;
+    }
+    interface GlobalStorage {
+        globalHas(contract: string, key: string): boolean;
+        globalGet(contract: string, key: string): string | null;
+        globalMapHas(contract: string, key: string, field: string): boolean;
+        globalMapGet(contract: string, key: string, field: string): string | null;
+        globalMapLen(contract: string, key: string): number;
+        globalMapKeys(contract: string, key: string): string[];
+    }
+    interface Storage extends LocalStorage, GlobalStorage {
+    }
+}
+
+declare const storage: IOSTContract.Storage;
diff --git a/types/iost-contract/tsconfig.json b/types/iost-contract/tsconfig.json
new file mode 100755
index 0000000000..49a7dc071d
--- /dev/null
+++ b/types/iost-contract/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "iost-contract-tests.ts"
+    ]
+}
diff --git a/types/iost-contract/tslint.json b/types/iost-contract/tslint.json
new file mode 100755
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/iost-contract/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }
diff --git a/types/iost-contract/tx.d.ts b/types/iost-contract/tx.d.ts
new file mode 100755
index 0000000000..0d60b25d56
--- /dev/null
+++ b/types/iost-contract/tx.d.ts
@@ -0,0 +1,15 @@
+//
+
+declare namespace IOSTContract {
+    interface Tx {
+        time: number;
+        hash: string;
+        expiration: number;
+        gas_limit: number;
+        gas_ratio: number;
+        auth_list: object;
+        publisher: string;
+    }
+}
+
+declare const tx: IOSTContract.Tx;