To reduce water flowing sound of an electromagnetic water supply valve loaded on a domestic electric instruments (for example, a fully automatic washer, a dish washer, a dryer or the like).

A foam generating device is provided in the flow-out port of the pilot valve type electromagnetic water supply vale for opening and closing a main valve seat by opening and closing a pilot olifice of a diaphragm valve with a plunger to be linked with the diaphragm valve.