PURPOSE: To allow a door to be held at an arbitrary position, and improve the opening/closing operability by pivotally supporting an arm on the body side provided with a pair of engaging means where a plurality of engaging parts are provided in a row in a mutually opposite direction, and providing two lockers on a door check body.

CONSTITUTION: When a door 30 is opened to the right to open the door 30, a large operating force is required to open the door 30 because a first locker 14 is suppressed by the force of a suppressing spring 16a. The opening of this door 30 is set by the engaging position with an engaging part 22a of an engaging means 22 of the first locker 14. The operating force to open the door 30 against the suppressing spring 16a is required to open the door 30 held at an arbitrary opening again. On the other hand, when the door 30 is closed, a large door-opening force is required similarly because a second locker 15 is suppressed by a suppressing spring 17a, and the door 30 is locked by the interference of a guide part 24 and a stopper 18.