A compressor module comprising: a rotational driving machine having an output shaft which is rotationally driven around an axis; a compressor which is arranged side by side in an axial direction in which the axis extends with respect to the rotational driving machine, and to which rotation of the output shaft is transmitted; a base plate which supports the rotational driving machine and the compressor from below in a vertical direction (Dv), and is larger than the rotational driving machine and the compressor when viewed from above in the vertical direction (Dv); and a storage tank which is configured to store a lubricating oil used in the rotational driving machine and the compressor, wherein the storage tank has a tank main body that is provided on an outer side of the base plate in a width direction (Dw) intersecting with the axial direction, wherein the tank main body has a tubular shape which extends in a direction (Da) including the axial direction, wherein the tank main body extends from a position overlapping at least a part of the rotational driving machine to a position overlapping at least a part of the compressor when viewed in a direction orthogonal to the axial direction, and wherein the width direction (Dw) is a direction different from the vertical direction (Dv), characterized in that the rotational driving machine has an output shaft which is configured to be driven, and a drive machine first bearing and a drive machine second bearing that rotatably support the output shaft around a first axis, wherein the compressor has a rotor that is configured to rotate by transmitting a rotation of the output shaft, and a compressor first bearing and a compressor second bearing that rotatably support the rotor around a second axis, wherein the compressor module further includes a plurality of drain pipings (61A-61E) which are configured to return the lubricating oil from the drive machine first bearing, the drive machine second bearing, the compressor first bearing, and the compressor second bearing and wherein the plurality of drain pipings (61A-61E) are connected to the tank main body by extending straight and by extending in the width direction (Dw) obliquely with respect to the vertical direction (Dv). a rotational driving machine having an output shaft which is rotationally driven around an axis; a compressor which is arranged side by side in an axial direction in which the axis extends with respect to the rotational driving machine, and to which rotation of the output shaft is transmitted; a base plate which supports the rotational driving machine and the compressor from below in a vertical direction (Dv), and is larger than the rotational driving machine and the compressor when viewed from above in the vertical direction (Dv); and a storage tank which is configured to store a lubricating oil used in the rotational driving machine and the compressor, wherein the storage tank has a tank main body that is provided on an outer side of the base plate in a width direction (Dw) intersecting with the axial direction, wherein the tank main body has a tubular shape which extends in a direction (Da) including the axial direction, wherein the tank main body extends from a position overlapping at least a part of the rotational driving machine to a position overlapping at least a part of the compressor when viewed in a direction orthogonal to the axial direction, and wherein the width direction (Dw) is a direction different from the vertical direction (Dv), characterized in that the rotational driving machine has an output shaft which is configured to be driven, and a drive machine first bearing and a drive machine second bearing that rotatably support the output shaft around a first axis, wherein the compressor has a rotor that is configured to rotate by transmitting a rotation of the output shaft, and a compressor first bearing and a compressor second bearing that rotatably support the rotor around a second axis, wherein the compressor module further includes a plurality of drain pipings (61A-61E) which are configured to return the lubricating oil from the drive machine first bearing, the drive machine second bearing, the compressor first bearing, and the compressor second bearing and wherein the plurality of drain pipings (61A-61E) are connected to the tank main body by extending straight and by extending in the width direction (Dw) obliquely with respect to the vertical direction (Dv).