PURPOSE: To enable make and break of great electric power without using a displacement enlarging mechanism by jumping a permanent magnet with laminated piezoelectric actuators and moving to another end to hold the contact between fixed contacts and moving contacts with the permanent magnet and magnetic attraction force between powerful magnetic substances arranged behind the fixed contacts.

CONSTITUTION: A pair of laminated piezoelectric actuators 1 are arranged opposite to each other at a preset space at both ends of an insulating case 6, a pair of soft powerful magnetic substances 2 are arranged on respective planes opposite to the laminated piezoelectric actuators 1 via insulating plates 10, fixed contacts 3A, 3B are provided opposite to each other inside the soft powerful magnetic substances 2, moving contacts 4A, 4B are provided at positions opposite to the fixed contacts 3A, 3B, and a permanent magnet 5 is arranged in a space between both fixed contacts 3A, 3B together with a holder 13 which holds a lead terminal 7 passing through the opening 8 of the case 6. The permanent magnet 5 is jumped by the impulse-driven laminated piezoelectric actuators 1 and moved to another end to hold the contact between the fixed contacts 3A, 3B and the moving contacts 4A, 4B with magnetic attraction force between the powerful magnetic substances 2. It is thus possible to perform make and break of great electric power without using a displacement enlarging mechanism.