An image forming apparatus includes an opening/closing member, an opening/closing detecting device and an operating member. The opening/closing member turns integrally with a supporting shaft around the supporting shaft. The opening/closing detecting device detects an opening/closing state of the opening/closing member. The operating member turns integrally with the supporting shaft so as to interlock with turning of the opening/closing member. The operating member includes a pressing part having an external circumference face around the supporting shaft and a relief part having an external circumference face inside a rotation locus of the pressing part. The opening/closing detecting device includes a switch part switching between an ON position depressed by the pressing part in accordance with turning of the operating member, and an OFF position depressing-released by the relief part in accordance with turning of the operating member, and detects the opening/closing state of the opening/closing member by switching the switch part.