PCT No. PCT/JP81/00210 Sec. 371 Date Apr. 21, 1982 Sec. 102(e) Date Apr. 21, 1982 PCT Filed Sep. 1, 1981 PCT Pub. No. WO82/00918 PCT Pub. Date Mar. 18, 1982.A small electromagnetic relay in which an electromagnet (116), having at least a core (130), a coil bobbin (128) and an armature (117), is accommodated in a box-shaped insulated housing (110) which has surrounding walls (114a, 114b) to hold contact terminals (111a, 111b, 112a, 112b), the electromagnet having an accommodation portion that is molded on the outer surface of a flange (138) of the coil bobbin as a unitary structure to rotatably hold the armature, the coil bobbin being equipped with the armature and the core.