Provided are a spindle device in which the replacement of a main spindle can be performed in an extremely short time and downtime during the maintenance can be shortened and which can have a high productivity; and a composite machine tool with the spindle device. A spindle device (20) has wirings (41, 42) extending from a main spindle (30) and disposed on a support arm side through a bracket (21).A joint part (74) provided at a position separated from the extended portions of the wirings (41, 42) by a predetermined distance is contained in the bracket (21).