An arrangement comprising a component of a vehicle and a pump device suitable to be mounted in the vehicle, the pump device comprising: a motor portion having a shaft having a center thereof on an axially extending center axis, a rotor which is fixed to the shaft, and a stator which is arranged on a radially outer side of the rotor, wherein the axis includes a first axial side and a second axial side opposite to the first axial side; a pump portion (30, 230, 330) which is arranged on the first axial side of the motor portion, and driven by the motor portion; a case having a lid portion which is arranged on the second axial side of the motor portion, a tube body (17, 14) including a first tube portion arranged on the lid portion and a second tube portion arranged on the first tube portion at the first axial side, and a flange portion (15, 19) arranged between the first tube portion and second tube portion and extending radially outward from the tube body (17,14); the pump portion (30,130,230,330) including: an inner rotor which is attached to the shaft; an annular outer rotor which surrounds a radially outer side of the inner rotor; a pump body (31, 131, 231, 331) which accommodates the inner rotor and the outer rotor; and a pump cover which is attached to the pump body (31,131,231,331) at the first axial side, wherein the pump body (31,131,231,331) has a pump chamber which is recessed from a surface on the first axial side toward the second axial side and accommodates the inner rotor and the outer rotor, and a through-hole which axially penetrates through the pump body (31,131,231,331) and through which the shaft passes, wherein the pump cover has an inlet and an outlet which are in communication with the pump chamber, wherein a surface of the flange portion at the first axial side is in contact with a surface of the component of the vehicle and the pump device is fixed to the component via the flange portion, wherein the component has a pump device accommodation portion which is recessed from the surface toward the first axial side, wherein the pump device accommodation portion has an accommodation main body portion (BD1a) and a fitting portion (BD1b), wherein at least a portion of the motor portion is arranged in a radially inner side of the accommodation main body portion (BD1a) opening toward the surface, and the fitting portion (BD1b) which is arranged on the accommodation main body portion (BD1a) at the first side is fitted with the pump body (31, 131, 231, 331). a motor portion having a shaft having a center thereof on an axially extending center axis, a rotor which is fixed to the shaft, and a stator which is arranged on a radially outer side of the rotor, wherein the axis includes a first axial side and a second axial side opposite to the first axial side; a pump portion (30, 230, 330) which is arranged on the first axial side of the motor portion, and driven by the motor portion; a case having a lid portion which is arranged on the second axial side of the motor portion, a tube body (17, 14) including a first tube portion arranged on the lid portion and a second tube portion arranged on the first tube portion at the first axial side, and a flange portion (15, 19) arranged between the first tube portion and second tube portion and extending radially outward from the tube body (17,14); the pump portion (30,130,230,330) including: an inner rotor which is attached to the shaft; an annular outer rotor which surrounds a radially outer side of the inner rotor; a pump body (31, 131, 231, 331) which accommodates the inner rotor and the outer rotor; and a pump cover which is attached to the pump body (31,131,231,331) at the first axial side, an inner rotor which is attached to the shaft; an annular outer rotor which surrounds a radially outer side of the inner rotor; a pump body (31, 131, 231, 331) which accommodates the inner rotor and the outer rotor; and a pump cover which is attached to the pump body (31,131,231,331) at the first axial side, wherein the pump body (31,131,231,331) has a pump chamber which is recessed from a surface on the first axial side toward the second axial side and accommodates the inner rotor and the outer rotor, and a through-hole which axially penetrates through the pump body (31,131,231,331) and through which the shaft passes, wherein the pump cover has an inlet and an outlet which are in communication with the pump chamber, wherein a surface of the flange portion at the first axial side is in contact with a surface of the component of the vehicle and the pump device is fixed to the component via the flange portion, wherein the component has a pump device accommodation portion which is recessed from the surface toward the first axial side, wherein the pump device accommodation portion has an accommodation main body portion (BD1a) and a fitting portion (BD1b), wherein at least a portion of the motor portion is arranged in a radially inner side of the accommodation main body portion (BD1a) opening toward the surface, and the fitting portion (BD1b) which is arranged on the accommodation main body portion (BD1a) at the first side is fitted with the pump body (31, 131, 231, 331).