PURPOSE: To improve the appearance, the styling and the like with a minimized thickness of a time piece by supporting the body of the time piece rotatably through an auxiliary plate pivoted at one end of a support.

CONSTITUTION: When the body 9 of a time piece is pulled upward to show a display surface hidden on the undersurface, a pair of auxiliary plates 6 and 6 are erected as released from the retention with side wall 3 and 3, while freeing the body 9 of the time piece engaged with the tip of a pin 4 for pivoting the auxiliary plate 6 through a recess 10. The body 9 of the time piece is turned by 180° about a pin 7 and forced into a support 1 to alter the display surface. This enables a tight holding of the time piece body on the support regardless of a crown projected on the side of the body, a switch button or the like thereby eliminating contamination of a display section facing the support.