An AC adapter (electronic device) comprises a coil spring (elastic member), an engagement member, and an AC plug in which a guide groove is formed in a holding portion thereof. One end portion of the coil spring is fixed in the holding portion, and the other end portion of the coil spring is fixed in a case. One end portion of the engagement member is engaged with the guide groove of the holding portion. The engagement place of the one end portion of the engagement member and the fixation place of the one end portion of the coil spring sandwich a central axis of a rotary shaft and are symmetric with respect to the central axis. The other end portion of the engagement member is engaged with a hole portion formed in the case. The guide groove engaged with the one end portion of the engagement member is shaped like a heart so as to rotate the AC plug. A heart-shaped concave portion of the guide groove functions as a fixing groove portion for temporarily fixing the AC plug in a position where the AC plug is rotated nearly 90 degrees.