Object To provide a compact vehicle frame structure capable of hardly having an influence of external force generated by, for example, impact on a battery while suppressing occurrence of a dramatic weight increase. Constitution The compact vehicle frame structure includes: a vehicle body frame (20); a floor (30) permitting placement of feet of a driver seated on a seat (31) provided in the vehicle body frame (20); and a battery (B) provided on a bottom side of the floor (30) and supplying electric power to a motor (M), and the vehicle body frame (20) is provided with: a pair of right and left inner frame members (21) provided on sides of the battery (B); and a pair of right and left outer frame members (22) each having a battery protection part (22p) of a hollow shape located on an outer side of the inner frame member (21) and separately from the battery (B).