In a wrist-carried camera having a watch function, a body including a taking lens is provided in such a manner as to freely rotate with respect to a band part through a rotation mechanism, and a release switch is provided at the unrotated band part. The device includes a storage node which has a vertical surface extending in the direction perpendicular to the surface of a semiconductor substrate, and a dielectric film for tilt prevention purposes which is brought into close contact with the side surface of the vertical surface and which prevents the vertical surface from tilting. For carrying out a roll change, the casting rate is reduced as a function of the feed rate of the rolling mill andor the roll-changing time, andor the buffer length of the roller hearth furnace, andor the final rolled thickness after the strand has been cut to length.