An image forming device includes a main casing and a cartridge support member. The main casing provides a fulcrum part. The cartridge support member supports a plurality of cartridges and is movable among an internal position in which the cartridge support member is accommodated in the main casing, an external position in which the cartridge support member is pulled outside the main casing, and a cartridge mounting position. The cartridge support member is slidable in a pulled-out direction from the internal position to the external position, and is pivotable between the external position and the cartridge mounting position. The cartridge support member has an upstream portion and a downstream portion disposed downstream of the upstream portion in the pulled-out direction. The cartridge support member pivots about the fulcrum part positioned near the upstream portion when the cartridge support member moves from the external position to the cartridge mounting position.