A toner supply device includes: a device body; and a toner bottle, wherein a toner supply port is formed in each of the device body and the toner bottle, either one of the device body and the toner bottle includes: a shutter that can be selectively moved between a shielding position and an open position; and a first engagement part, the other one of the device body and the toner bottle includes a second engagement part, the shutter is moved from the shielding position to the open position and the shutter opens the toner supply port, and then the first engagement part is engaged with the second engagement part, and the shutter is moved from the open position to the shielding position and the shutter closes the toner supply port, and then engagement between the first engagement part and the second engagement part is disengaged.