To provide a device for measuring vehicle indoor deformation in a collision experiment which can easily measure the deformation of dash panel in collision.

A wire line 1A is withdrawn from a wire 1 with cover, and its one end is fixed to nearby a right front pillar 3 or the right front pillar 3, for example, among left and right front pillars. By attaching the middle of the withdrawn wire line 1A to the left front pillar 2 in a state movable along the longitudinal direction, the wire line 1A is extended along the dash panel 4. A displacement meter 15 is placed to a floor panel 13 near the center pillar 11 which deforms smaller than the front panel in collision and the other end of the wire line 1A is connected with the displacement meter 15.