PURPOSE: To shorten a spool, and attain high rigidity by providing a cylindrical spool having a communicating part which has the same circumferential surface with a sealing part and in which a guiding object part to be slidably guided by a support guide part is formed in the shaft direction.

CONSTITUTION: Voltage is impressed on an electromagnetic actuator 40, and when a plunger 42 elongates, a spool 30 moves leftward in the shaft direction agaist energizing force of a coil spring 44, and an A port 21 is opened to a P port 23. At this time, since the spool 30 moves in the shaft direction in a sleeve 20 when a guiding object part 36 formed in passages 31a and 31b slidingly moves on a support guide part 28 of the sleeve 30, there is no need to make the land 32 function as a guide part. Therefore, the total length of the spool 30 is shortened, and a fluid passage control valve OCI itself is downsized.