A scooter type vehicle comprising: a body frame including a head pipe, a down frame extending downward from the head pipe, a first lower frame made of a pipe extending rearward in front-rear direction of the vehicle from the down frame, and a first seat frame extending rearward in front-rear direction of the vehicle and upward from the first lower frame in up-down direction of the vehicle; a seat arranged upward of the first seat frame; a footboard arranged forward of the seat in front-rear direction of the vehicle and upward of the first lower frame in up-down direction of the vehicle, the footboard is configured to rest feet of a rider seated on the seat; a pivot shaft attached to the first lower frame or the first seat frame; and a power unit pivotally supported on the pivot shaft, wherein: the first lower frame and the first seat frame are formed as separate parts; the first lower frame includes a main connecting portion connected to a lower end surface of the first seat frame, and a rear extension located rearward in front-rear direction of the vehicle relative to the main connecting portion, wherein a lower end of a rear edge of the rear extension is located forward in front-rear direction of the vehicle relative to an upper end of a rear edge of the rear extension, characterized in that the scooter type vehicle includes an internal reinforcement member that is arranged inside the first lower frame and rearward relative to a front end of the main connecting portion in front-rear direction of the vehicle. a body frame including a head pipe, a down frame extending downward from the head pipe, a first lower frame made of a pipe extending rearward in front-rear direction of the vehicle from the down frame, and a first seat frame extending rearward in front-rear direction of the vehicle and upward from the first lower frame in up-down direction of the vehicle; a seat arranged upward of the first seat frame; a footboard arranged forward of the seat in front-rear direction of the vehicle and upward of the first lower frame in up-down direction of the vehicle, the footboard is configured to rest feet of a rider seated on the seat; a pivot shaft attached to the first lower frame or the first seat frame; and a power unit pivotally supported on the pivot shaft, wherein: the first lower frame and the first seat frame are formed as separate parts; the first lower frame includes a main connecting portion connected to a lower end surface of the first seat frame, and a rear extension located rearward in front-rear direction of the vehicle relative to the main connecting portion, wherein a lower end of a rear edge of the rear extension is located forward in front-rear direction of the vehicle relative to an upper end of a rear edge of the rear extension, characterized in that the scooter type vehicle includes an internal reinforcement member that is arranged inside the first lower frame and rearward relative to a front end of the main connecting portion in front-rear direction of the vehicle. the first lower frame and the first seat frame are formed as separate parts; the first lower frame includes a main connecting portion connected to a lower end surface of the first seat frame, and a rear extension located rearward in front-rear direction of the vehicle relative to the main connecting portion, wherein a lower end of a rear edge of the rear extension is located forward in front-rear direction of the vehicle relative to an upper end of a rear edge of the rear extension, characterized in that the scooter type vehicle includes an internal reinforcement member that is arranged inside the first lower frame and rearward relative to a front end of the main connecting portion in front-rear direction of the vehicle.