The present invention relates to a turbo compressor which is capable of minimizing deformation of construction parts which may occur in welding or after welding and simplifying the manufacture and assembly by forming the outer diameter of a driving shaft so as to be stepped and joining the construction parts with bolts and pins. The turbo compressor in accordance with the present invention comprises a sealed container having separate inlets on each end, a first bearing housing and a second bearing housing and a driving motor installed inside of the sealed container, a driving shaft with its both ends separately inserted-penetrates through holes in the first and second bearing housings, a sealing member fixedly joined to the first bearing housing, a radial supporting member for supporting the driving shaft in the radial direction, first and second impellers and first and second diffuser members fixedly connected to the both ends of the driving shaft, an interconnection pipe for connecting the inlets, and an axial supporting member for supporting the driving shaft in the axial direction.