To stably support a device body on a stand without protruding a support arm from the outer edge of the device body.

The stand 2 has three support arms on the upper part. Three support recesses 26A-26C recessed upward are provided on a bottom face 20a of a low case 20 of the device body 100. The edge of the support arm is in a state where it is fitted to the inside of the support recess, and a wall part of a corresponding support recess is pushed in an intermediate position direction by each edge by urging the three support arms in a closing direction. Thereby the three support arms cooperate, and a lower case 20 is supported through the corresponding support recess.