PURPOSE: To prevent clothes for drying from wetting by providing an opening closing operation means which operates a screen through sensing of a moisture content or moisture by means of a humidity sensor and automatically switches the surface of a drying place into a covering-non-covering state.

CONSTITUTION: During rainfall and when humidity is increased to a value higher than an allowable limit, a humidity sensor 1 senses to slacken a wire 3b of an opening closing operation means 3. A screen 2 is lowered along guides 6 under gravity of a lower frame 11 additionally functioning as a weight and the front and both sides of a drying place are covered with the screen. During nonrainfall and when humidity is decreased, the humidity sensor 1 senses to operate the motor of a hoisting mechanism part 3a of the opening closing operation means 3, the wire 3b is hoisted to hoist the screen 2. This constitution reliably prevent clothes for drying from wetting.