diff --git a/pyworld/pyworld.pyi b/pyworld/pyworld.pyi
new file mode 100644
index 0000000..99668ac
--- /dev/null
+++ b/pyworld/pyworld.pyi
@@ -0,0 +1,63 @@
+# PyWorld type stub
+from typing import Tuple
+
+import numpy as np
+from numpy.typing import NDArray
+
+
+def wav2world(
+    x: NDArray[np.float64],
+    fs: int,
+    frame_period: float = 5.0,
+    f0_floor: float = 71.0,
+    f0_ceil: float = 800.0,
+) -> Tuple[NDArray[np.float64], NDArray[np.float64], NDArray[np.float64]]: ...
+
+
+def synthesize(
+    f0: NDArray[np.float64],
+    spectrogram: NDArray[np.float64],
+    aperiodicity: NDArray[np.float64],
+    fs: int,
+    frame_period: float = 5.0,
+) -> NDArray[np.float64]: ...
+
+
+def dio(
+    x: NDArray[np.float64],
+    fs: int,
+    f0_floor: float = 71.0,
+    f0_ceil: float = 800.0,
+    channels_in_octave: float = 2.0,
+    frame_period: float = 5.0,
+    speed: int = 1,
+) -> Tuple[NDArray[np.float64], NDArray[np.float64]]: ...
+
+
+def stonemask(
+    x: NDArray[np.float64],
+    f0: NDArray[np.float64],
+    temporal_positions: NDArray[np.float64],
+    fs: int,
+) -> NDArray[np.float64]: ...
+
+
+def cheaptrick(
+    x: NDArray[np.float64],
+    f0: NDArray[np.float64],
+    temporal_positions: NDArray[np.float64],
+    fs: int,
+    q1: float = -0.15,
+    f0_floor: float = 71.0,
+    fft_size: int = 2048,
+) -> NDArray[np.float64]: ...
+
+
+def d4c(
+    x: NDArray[np.float64],
+    f0: NDArray[np.float64],
+    temporal_positions: NDArray[np.float64],
+    fs: int,
+    threshold: float = 0.85,
+    fft_size: int = 2048,
+) -> NDArray[np.float64]: ...
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