Evaporated fuel treatment device and fluid treatment device

An evaporated fuel treatment device comprising:

• a pump mounting part provided in an intake passage of an internal combustion engine on a side upstream of a supercharger;
• a purge pump including a discharge part, a first introduction part, and a second introduction part;
• a bypass passage that communicates between the intake passage on a side downstream of the supercharger and the first introduction part;
• and
• a purge passage that communicates between a canister containing an adsorbent material that adsorbs evaporated fuel and the second introduction part,
• wherein in a state where the purge pump is mounted to the pump mounting part, fluid introduced from the first and second introduction parts is discharged through the discharge part into the intake passage,
• the purge pump is a cylindrical pump formed with a pump flow path that extends along a flow direction of the fluid to be introduced from the first introduction part and that guides, to the discharge part, the fluid to be introduced from the first introduction part,
• a reduced part with a diameter decreasing toward downstream is formed in the pump flow path on the side downstream of the first introduction part along the flow direction,
• in a state where the purge pump is mounted to the pump mounting part, a connection flow path that connects the second introduction part and the pump flow path is formed, and
• in a state where the purge pump is removed from the pump mounting part, the connection flow path communicates with outside.