To treat a large quantity of wood in a short time during drying of the wood when the wood is warped or bent and this warpage or bend can be corrected.

This wood drying device 1 is equipped with a high-frequency heating device 2 and straightening device 3 housed inside a drying chamber 10. The high-frequency heating device 2 heats a wood W by high-frequency emission. The correcting device 3 straightens the wood W thermally softened by the high-frequency heating device 2 to the specified shape, and has a vertical straightening device 31 for straightening the wood W in the vertical direction and a device for straightening to the right/left for straightening the wood W in the direction to the right/left. The high-frequency heating device 2 and the straightening device 3 are arranged in a production line fashion by a roller conveyor 4 as a conveying means. In the drying chamber 10, a hot blast introducing duct 103 and a hot blast exhaust duct 104 are installed.