Abstract: A piezoelectric/electrostrictive device has a base 10a including a pair of right and left movable parts 11, 12 and a fixing part 13 on one end thereof, and a piezoelectric/electrostrictive element 10b on the side surfaces of movable parts 11, 12 of base 10a. The adhesive force of bonding a component H sandwiched and held on the other end of movable parts 11, 12 is enhanced. Base 10a constituting the piezoelectric/electrostrictive device has a pair of long mounting parts 15, 16 for mounting component H on the other end of movable parts 11, 12. Mounting parts 15, 16 extend for a predetermined length while holding slit-shaped gaps 15a, 16a of a predetermined width along the inside surfaces of movable parts 11, 12 by being turned around at the other end of movable parts 11, 12. This increases the bonding area of mounting parts 15, 16 to component H, thereby greatly improving the adhesive force of bonding the component.