An accelerator device for performing an acceleration operation includes a rotary body which rotates with rotation of a grip, a magnet which rotates with rotation of the rotary body, a rotation angle detector which detects a rotation angle of the magnet, an urging member which returns the grip to an original point position by urging the rotary body, and a separation member which separates the rotary body and the rotation angle detector, the rotation angle detector is fixed to the separation member and the rotary body is rotatably held thereby while the urging member urges the rotary body toward the separation member as well as in the rotation direction, so that positional variation of the rotation angle detector against the magnet can be prevented.