To provide an opening hanger of simplified structure and of excellent operability capable of opening/closing arms instantaneously by fingers of one hand.

Base end parts 31, 41 of arms 3, 4 are shaft-supported on a frame 2 having a hook 1 at an upper end center part. Tooth parts 5, 5 which are engaged with each other are formed in the base end parts 31, 41 of the arms 3, 4, so they are opened/closed symmetrically. A through hole 9 is formed in a side part of the frame 2, a stopper 7 to be engaged with the through hole 9 in the frame 2 when the arms 3, 4 are opened is provided on a side part of the base end part 31 of one arm 3, they are composed in such a way that the stopper 7 can be engaged/released from the outer side with fingers of a hand, and a spring 6 to energize the arms 3, 4 in opening directions is installed between the frame 2 and the other arm 4.