A toe angle measuring instrument comprising a measurement unit having a seating table seating a hub of a vehicle on a seating stand and movable in the lateral direction of the vehicle and in a rotating direction in plan view relative to a second base member. The toe angle measuring instrument further comprising a measured member having a vertical measurement surface extending from the seating table to the outside and non-contact distance sensors installed oppositely to the measurement surface with reference to the second base member and measuring distances (x1) and (x2) up to the measurement surface from two positions apart a distance (y1) from each other. The measurement surface is set to face in a direction forming an acute angle relative to a lateral direction of the vehicle.