Electromagnetic pump device

An electromagnetic pump device comprising:

• a suction check valve including a tubular portion and a flange portion that extends in a radial direction from an end edge of the tubular portion, the suction check valve being formed with a through hole that penetrates the tubular portion and the flange portion to form a suction port in an end surface of the flange portion;
• and
• a strainer attached so as to cover the end surface of the flange portion to form the suction port and having a pore forming region which is larger than an inside diameter of the through hole at the tubular portion and in which a large number of pores are formed, wherein
• the suction check valve is formed with a diameter reducing portion formed such that the inside diameter of the through hole is reduced from the flange portion toward the tubular portion with a degree of diameter reduction varied from a large value to a small value, and
• the diameter reducing portion is formed from at least two stages of adjacent tapered surfaces of which inclination angles with respect to an axial center of the through hole are larger than 0 degrees and smaller than 90 degrees, and which become smaller from the end surface of the flange portion toward the tubular portion.