A fixing device includes an endless fixing belt capable of rotational movement, a pressure member that presses from the outside of the fixing belt, a nip forming member arranged on the inner circumference surface side of the fixing belt and forms a fixing nip region between the fixing belt and the pressure member, and a support member supporting the nip forming member from the side opposite to the fixing belt. The support member includes a first support portion and a second support portion. The first support portion supports the nip forming member. The second support portion stands from the surface of the first support portion opposite to the nip forming member so that the center portion in the conveying direction of the recording medium is located at the downstream side of the center portion of the fixing nip region in the conveying direction and within the fixing nip region.