To change the direction of a support shaft for a bobbin when necessary.

This wire bobbin support device 1 supports the bobbin 4 of storing a wire 3 for a wire saw 2 in a winding state on a machine base 5, and includes a turning shaft 6 installed in a turnable state to the machine base 5, a bobbin support shaft 7 installed on the turning shaft 6 and rotatably supporting the bobbin 4 with one end as a free end, and a drive motor 8 installed on the turning shaft 6 and rotating the bobbin 4 supported by the bobbin support shaft 7, and attaches and detaches the bobbin 4 with respect to the free end side of the bobbin support shaft 7 of an outward turning state by setting the free end of the bobbin support shaft 7 in the outward turning state to the machine base 5 by turning the turning shaft 6 to a predetermined angle when replacing the bobbin 4 or abolishing the used wire 3.