PURPOSE: To realize the small sized directional coupler of an integral structure which is manufactured at a low cost, in which a problem of the productivity of the directional coupler manufactured through pressing and baking of green sheets is solved.

CONSTITUTION: The directional coupler 1 is formed with a center dielectric body 2, and outer dielectric bodies 3, 4 provided to both sides of the said center dielectric body 2, and a ground electrode 4 and a terminal electrode 5 are formed to both sides of the outer circumference. The terminal electrode 5 and the ground electrode 4 are separated by a half throughhole 7 to be insulated.