To provide a correction tool for reducing tiredness easy-to-produce in driving an automobile, especially an automatic transmission vehicle.

The posture correction tool comprises a bar-like cushion 1 having suitable elasticity and restoration property. The bar-like cushion 1 is manufactured to have the length from a seat 4 to a proximity of the flank of a driver, and an attaching surface 3 of a magic tape or the like disposed on the back surface side is detachably attached to an attached surface 5 disposed on the backrest 2 of the seat 4.