An image forming apparatus, comprising: a tandem image forming unit in which four image forming units are arranged in parallel to each other, wherein each image forming unit includes a latent image bearer; a development device removably installable in an apparatus body in an installation direction, the development device including a developer bearer to carry developer to a development range facing the latent image bearer; a cooling device including a heat receiver containing coolant to draw heat from the development device; a pressing means for pressing the heat receiver of the cooling device against a side wall of the development device; an engaging and disengaging unit for engaging and disengaging the heat receiver from the development device by moving the heat receiver in parallel to the installation direction; and a shifting means for moving the heat receiver, wherein, in installation of the development device in the apparatus body, the shifting means is configured to contact the development device and to move the heat receiver together with the development device in the installation direction, wherein the engaging and disengaging unit comprises a holder to hold the heat receiver via the pressing means, and a holder supporter to support the holder movably in the installation direction of the development device, characterized in that the shifting means includes a projection projecting from the development device toward the heat receiver, and a contact portion provided to the holder of the engaging and disengaging unit, wherein the contact portion is positioned in a downstream end portion of the holder in the installation direction and includes a face which is disposed perpendicular to the installation direction and pushed by the projection when the development device is installed in the apparatus body, wherein when the image forming unit is being inserted into the apparatus body, the downstream end portion in the insertion direction of the projection comes in contact with the contact portion, and when the image forming unit is inserted further from this state, the projection is configured to push the contact portion, and the holder is moved downstream in the insertion direction together with the development device such that the heat receiver held by the holder is configured to move toward the development device in conjunction with insertion of the development device. a tandem image forming unit in which four image forming units are arranged in parallel to each other, wherein each image forming unit includes a latent image bearer; a development device removably installable in an apparatus body in an installation direction, the development device including a developer bearer to carry developer to a development range facing the latent image bearer; a cooling device including a heat receiver containing coolant to draw heat from the development device; a pressing means for pressing the heat receiver of the cooling device against a side wall of the development device; an engaging and disengaging unit for engaging and disengaging the heat receiver from the development device by moving the heat receiver in parallel to the installation direction; and a shifting means for moving the heat receiver, wherein, in installation of the development device in the apparatus body, the shifting means is configured to contact the development device and to move the heat receiver together with the development device in the installation direction, wherein the engaging and disengaging unit comprises a holder to hold the heat receiver via the pressing means, and a holder supporter to support the holder movably in the installation direction of the development device, characterized in that the shifting means includes a projection projecting from the development device toward the heat receiver, and a contact portion provided to the holder of the engaging and disengaging unit, wherein the contact portion is positioned in a downstream end portion of the holder in the installation direction and includes a face which is disposed perpendicular to the installation direction and pushed by the projection when the development device is installed in the apparatus body, wherein when the image forming unit is being inserted into the apparatus body, the downstream end portion in the insertion direction of the projection comes in contact with the contact portion, and when the image forming unit is inserted further from this state, the projection is configured to push the contact portion, and the holder is moved downstream in the insertion direction together with the development device such that the heat receiver held by the holder is configured to move toward the development device in conjunction with insertion of the development device.