To provide a hinge capable of automatically moving a door attached with one hinge element to an open position by rotating the door by a given angle from a close position to the open position, and capable of automatically moving a door to the close position by rotating the door which is at the open position by a given angle to the close position.

A hinge 100 applies an inverted V-shaped object (chevron-shaped folding type) with a slope changeover region as an apex as a cam groove 129. When a cam pin 127 moves toward the slope changeover region on a first slope region of the cam groove 129 and when the cam pin 127 moves toward the slope changeover region on a second slope region of the cam groove 129, a compression spring 125 is pressed in a direction of compression by a cylindrical cam member 123 which moves in a direction separating from a first shaft cylinder 107 in a second shaft cylinder 115.