PURPOSE: To simplify a temperature sensing automatic opening and closing blind shutter mechanism by placing a shape memory alloy operating in a direction to close slats with the temperature rising to a blind driver opening and closing the slats by operation of strings, and providing a manual operating section closing the wings in the case of the temperature falling.

CONSTITUTION: Tilt angles of a large number of wings 15 can be adjusted by strings 13 and, at the same time, an operating body 16 of a shape memory alloy is operated to make the slats 15 tilt in the case of the temperature rising by the sunlight, etc. In the case of the temperature falling during the night, etc., a manual operating section 9 is turned to turn a wing opening and closing driver 12, and the slats 15 are closed. The slats 15 are automatically closed and, at the same time, manual operation can be also carried out. According to the constitution, a device can be simplified.