A sheet ejecting device includes a sheet conveyance path, an exit port, at least one ejection roller pair, and a sheet detection portion. The sheet detection portion detects a sheet being ejected. The sheet detection portion includes an actuator and a sensor. The actuator moves by contact with a sheet passing along the sheet conveyance path. The sensor detects the actuator. The actuator moves between a detectable position where the actuator is detectable by the sensor and an undetectable position where the actuator is not detectable by the sensor. The actuator has a sheet guide portion. The sheet guide portion extends along a sheet conveyance direction. The sheet guide portion moves, in a direction transverse to the sheet conveyance direction such that the actuator moves to the detectable position, by contact with the sheet passing along the sheet conveyance path and guides the sheet in the sheet conveyance direction.