A submersible pump (100) is a submersible pump (100) in which a one-sided waterway (6) extending along a rotation shaft (1) is provided on one side of a submersible pump main body (100a), and includes an impeller (4); and a pump casing (5) in which the impeller (4) is arranged, in which the pump casing (5) includes a tongue portion (53) that is arranged between a pump chamber (5a) in which the impeller (4) is arranged and an inlet opening (6a) of the one-sided waterway (6) when viewed from an axial direction of the rotation shaft (1), and a connection waterway (54) that is provided between the tongue portion (53) and an inner surface (55) of the pump casing (5), and is directly connected to the inlet opening (6a) from an upstream side when viewed from the axial direction of the rotation shaft (1).