A saddle type vehicle including a seat rail to which a seat on which a user is seated is attached, wherein: the seat rail includes an outer edge that is placed on an outward side in a vehicle body width direction and an inner edge that is placed on an inward side in the vehicle body width direction and higher than the outer edge , and the outer edge and the inner edge each include a stepped structure where a step part is formed by consecutive vertical surface and inclined surface; the seat includes a seat part on which the user is seated, a side part that is continuous with the seat part and extends toward a lower part of a vehicle body, and a sitting part that is provided to a reverse surface of the seat part , and a lowermost part of the side part is placed lower than a lowermost part of the sitting part ; and the sitting part that sits on an upper surface of the inner edge is surrounded by the side part , wherein the seat rail includes a left seat rail member , a right seat rail member , and a front cross-link member , a middle cross-link member , and a rear cross-link member that are cross-linked between the left seat rail member and the right seat rail member and extend in the vehicle body width direction, wherein the seat includes a pillion seat including a bottom plate and a skin that covers the bottom plate , and is provided with the sitting part inside an external edge of the bottom plate , and the skin is fixed at an end part of the bottom plate , characterized in that the pillion seat includes a catching part that is provided to a front part of the bottom plate and an engaged part that is provided to a rear part of the bottom plate ; and when the catching part catches the middle cross-link member and the engaged part is inserted into a slit of the rear cross-link member to be locked by an operation of a lock mechanism , the pillion seat is supported by the middle cross-link member and the rear cross-link member . the seat rail includes an outer edge that is placed on an outward side in a vehicle body width direction and an inner edge that is placed on an inward side in the vehicle body width direction and higher than the outer edge , and the outer edge and the inner edge each include a stepped structure where a step part is formed by consecutive vertical surface and inclined surface; the seat includes a seat part on which the user is seated, a side part that is continuous with the seat part and extends toward a lower part of a vehicle body, and a sitting part that is provided to a reverse surface of the seat part , and a lowermost part of the side part is placed lower than a lowermost part of the sitting part ; and the sitting part that sits on an upper surface of the inner edge is surrounded by the side part , wherein the seat rail includes a left seat rail member , a right seat rail member , and a front cross-link member , a middle cross-link member , and a rear cross-link member that are cross-linked between the left seat rail member and the right seat rail member and extend in the vehicle body width direction, wherein the seat includes a pillion seat including a bottom plate and a skin that covers the bottom plate , and is provided with the sitting part inside an external edge of the bottom plate , and the skin is fixed at an end part of the bottom plate , characterized in that the pillion seat includes a catching part that is provided to a front part of the bottom plate and an engaged part that is provided to a rear part of the bottom plate ; and when the catching part catches the middle cross-link member and the engaged part is inserted into a slit of the rear cross-link member to be locked by an operation of a lock mechanism , the pillion seat is supported by the middle cross-link member and the rear cross-link member . <EOS>