Mesh filter

A mesh filter filtering out foreign matter in fluid, comprising:

• a gate connection part in which a gate for injection molding is disposed;
• an outer cylinder surrounding the gate connection part;
• and
• a filter unit connecting an outer peripheral surface of the gate connection part to an inner peripheral surface of the outer cylinder along a radial direction of the gate connection part;
• wherein, when a virtual plane orthogonal to a central axis of the gate connection part is assumed to be an X-Y plane, the filter unit is formed along the X-Y plane,
• the filter unit except a connection portion connecting to the gate connection part and a connection portion connecting to the outer cylinder includes a plurality of longitudinal ribs formed at regular intervals parallel to each other along the X-Y plane, a plurality of transverse ribs formed at regular intervals parallel to each other along the X-Y plane, the plurality of transverse ribs crossing the plurality of longitudinal ribs, and a plurality of openings formed between the plurality of longitudinal ribs and the plurality of transverse ribs, and
• molten resin is injected from a gate opened toward a cavity portion shaping the gate connection part of a cavity of a metal mold into the cavity portion to form the gate connection part, the outer cylinder, and the filter unit integrally, make rib widths of the longitudinal ribs and the transverse ribs constant, and make shapes of the openings identical.