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 (64L, 64R) that is placed on an outward side in a vehicle body width direction and an inner edge (66L, 66R) that is placed on an inward side in the vehicle body width direction and higher than the outer edge (64L, 64R), and the outer edge (64L, 64R) and the inner edge (66L, 66R) 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 (152L, 152R, 172L, 172R) 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 (152L, 152R, 172L, 172R); and the sitting part (152L, 152R, 172L, 172R) that sits on an upper surface of the inner edge (66L, 66R) 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 (152L, 152R, 172L, 172R) 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 (168L, 168R) 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 (168L, 168R) 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 (64L, 64R) that is placed on an outward side in a vehicle body width direction and an inner edge (66L, 66R) that is placed on an inward side in the vehicle body width direction and higher than the outer edge (64L, 64R), and the outer edge (64L, 64R) and the inner edge (66L, 66R) 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 (152L, 152R, 172L, 172R) 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 (152L, 152R, 172L, 172R); and the sitting part (152L, 152R, 172L, 172R) that sits on an upper surface of the inner edge (66L, 66R) 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 (152L, 152R, 172L, 172R) 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 (168L, 168R) 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 (168L, 168R) 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.