A hinge, wherein, inter alia, intrusion of foreign matter in a contacting portion of a slide member and a cam member and resulting adhesion of an oil provided in the cam member to the foreign matter is reliability prevented from the closed state to the open state of a second wing member. The hinge is provided with an oil fence disposed on the outside close to the contacting portion of the cam member and slide member, the oil fence preventing, from the closed slate to the open state of the second wing member, foreign matter front intruding into the contacting portion of the slide member and cant member from the outside of the slide member and cant member.