Oil filter device

An oil filter device comprising:

• a filter case;
• a filter element disposed in a main passage provided in an internal space of the filter case;
• a valve body having conductivity and disposed in a bypass passage provided in the internal space;
• a valve shaft having conductivity and supported by the valve body via a valve insulating member;
• a valve disc having conductivity and movably supported by the valve shaft and configured to close the bypass passage by coming in contact with the valve body;
• a valve elastic member that generates an elastic force to bring the valve disc into contact with the valve body;
• a movable member having conductivity, connected to the valve body, configured to come into contact with the valve disc in a state where the valve disc comes into contact with the valve body and configured to separate from the valve disc after the valve disc separates from the valve body;
• and
• a controller that supplies current to the valve disc via the valve shaft to determine whether the bypass passage is closed based on an energization state across the valve disc and the valve body.