A vehicle body frame includes a first rib protruding from a bottom surface portion toward an upper side and extending along a first direction. A vehicle body cover includes a second rib protruding from a top surface portion toward a lower side and extending along a second direction. A lower frame portion of a holding member that holds a power storage body includes a first recessed groove portion recessed from a lower end surface toward the upper side and extending along the first direction. An upper frame portion of the holding member includes a second recessed groove portion recessed from an upper end surface toward the lower side and extending along the second direction. A power storage unit is sandwiched between the bottom surface portion of the vehicle body frame and the top surface portion of the vehicle body cover.