An electrically powered vehicle comprising: a chargeable/dischargeable power storage device; a motor configured to generate vehicle driving power when receiving electric power supplied from said power storage device, and to regenerate electric power, which is generated during regenerative braking of the vehicle, to said power storage device; an auxiliary load (42, 44); a charging control unit that sets a reference capacity of said power storage device for avoidance of overcharging said power storage device, said reference capacity is set so as to have a margin with respect to a fully charged capacity of said power storage device, said fully charged capacity of said power storage device decreasing with proceeding deterioration of said power storage device, and that sets a maximum charging power value (Win) permitted in said power storage device in accordance with a reference upper limit value (Smax) which is an upper limit value of a state of charge of said power storage device such that, if said state of charge of said power storage device is increased towards said reference upper limit value (Smax), said maximum charging power value (Win) is decreased, wherein said state of charge of said power storage device is a ratio of a remaining capacity of said power storage device, which corresponds to a current charge amount in said power storage device, to said fully charged capacity of said power storage device, said reference upper limit value (Smax) is a ratio of said reference capacity to said fully charged capacity of said power storage device; and a traveling control unit that controls (S13, S15) charging power for said power storage device within a range defined by said maximum charging power value (Win), said charging control unit setting said reference upper limit value (Smax) to be variable in accordance with a degree of deterioration of said power storage device by gradually increasing said reference upper limit value (Smax) such that said margin becomes smaller as the degree of deterioration of said power storage device is larger, characterized in that said traveling control unit performs first control until said margin is decreased to zero (S14, S16), and performs second control after said margin is decreased to zero (S14, S17), when regenerative electric power generated by said motor during regenerative braking of the vehicle exceeds said maximum charging power value (Win) by an excess of said regenerative electric power relative to said maximum charging power value (Win), said first control being control for regenerating, to said power storage device, said excess of said regenerative electric power, said second control being control for consuming the excess of said regenerative electric power using said auxiliary load (42, 44). a chargeable/dischargeable power storage device; a motor configured to generate vehicle driving power when receiving electric power supplied from said power storage device, and to regenerate electric power, which is generated during regenerative braking of the vehicle, to said power storage device; an auxiliary load (42, 44); a charging control unit that sets a reference capacity of said power storage device for avoidance of overcharging said power storage device, said reference capacity is set so as to have a margin with respect to a fully charged capacity of said power storage device, said fully charged capacity of said power storage device decreasing with proceeding deterioration of said power storage device, and that sets a maximum charging power value (Win) permitted in said power storage device in accordance with a reference upper limit value (Smax) which is an upper limit value of a state of charge of said power storage device such that, if said state of charge of said power storage device is increased towards said reference upper limit value (Smax), said maximum charging power value (Win) is decreased, wherein said state of charge of said power storage device is a ratio of a remaining capacity of said power storage device, which corresponds to a current charge amount in said power storage device, to said fully charged capacity of said power storage device, said reference upper limit value (Smax) is a ratio of said reference capacity to said fully charged capacity of said power storage device; and a traveling control unit that controls (S13, S15) charging power for said power storage device within a range defined by said maximum charging power value (Win), said charging control unit setting said reference upper limit value (Smax) to be variable in accordance with a degree of deterioration of said power storage device by gradually increasing said reference upper limit value (Smax) such that said margin becomes smaller as the degree of deterioration of said power storage device is larger, characterized in that said traveling control unit performs first control until said margin is decreased to zero (S14, S16), and performs second control after said margin is decreased to zero (S14, S17), when regenerative electric power generated by said motor during regenerative braking of the vehicle exceeds said maximum charging power value (Win) by an excess of said regenerative electric power relative to said maximum charging power value (Win), said first control being control for regenerating, to said power storage device, said excess of said regenerative electric power, said second control being control for consuming the excess of said regenerative electric power using said auxiliary load (42, 44).