A fixing device includes a heater, a heating rotary member, a pressure rotary member, and a guide member. The heating rotary member is rotated while being heated by the heater. The pressure rotary member is in pressure contact with part of an outer circumferential surface of the heating rotary member so as to be rotated and so as to form a pressure contact portion which allows a recording medium to pass therethrough. The guide member has a guide portion which guides a leading end of the recording medium toward part of the outer circumferential surface of the heating rotary member. The guide portion has a guide ending portion having a central portion and left and right end portions in a direction parallel to a rotational axis direction of the heating rotary member. The central portion is recessed relative to the left and right end portions.