To solve the problem that operation speed in a magnetic relay is slower in comparison with that in a noncontact switching element such as a transistor, and an energy loss is larger in accordance with a switching operation in a mechanical contact.

In a relay circuit of the present invention, higher voltage can be applied for a predetermined period of time to both ends of an operation coil 2 constituting a magnetic relay 1, operation speed of a switching contact 3 is made to be faster, further, after switching operation of the switching contact 3 is finished, the voltage applied to the operation coil 2 is decreased as fast as possible, thereby, the relay circuit, in which switching speed is faster and an energy loss consumed in the operation coil 2 is suppressed, is realized.