A battery holding structure comprising: a battery adapted to be mounted on a vehicle and including a brim provided at a lower part thereof so as to protrude outward; a carrier including a main body accommodating at least the lower part of the battery and a flange extends outward from an upper end of the main body; and a clamp for fixing the battery to the carrier, wherein an upper surface of the brim is an inclined surface that extends downward and outward, the clamp includes a first contacting part that comes into contact with the inclined surface positioned at one end in a first direction of the battery and presses a bottom of the battery against the carrier, a first standing part standing from the first contacting part, and a fastening part extending from the first standing part so as to be overlapped with the flange and fastened to the flange at a position outside the battery in the first direction, wherein a normal line of the inclined surface passing through a contact point (Pc) between the inclined surface and the first contacting part passes inside a fixing point (Ps) where the fastening part is fixed to the flange so as to be positioned on a battery side, wherein the first contacting part extends from a lower end of the first standing part at an angle closer to a horizontal direction than the inclined surface, the fastening part includes a fastening hole through which a fastening bolt can be inserted, and the fixing point (Ps) is a point closest to the battery in a peripheral region of the fastening hole and wherein the clamp further includes a second contacting part that is configured to come into contact with the inclined surface positioned at one end in a second direction orthogonal to the first direction and to press the bottom of the battery against the carrier, and a second standing part that extends upward from the second contacting part and is connected to the first standing part so as to form an angle of approximately 90 degrees therebetween, wherein the clamp is not fastened to the carrier at an outer side of the battery in the second direction. a battery adapted to be mounted on a vehicle and including a brim provided at a lower part thereof so as to protrude outward; a carrier including a main body accommodating at least the lower part of the battery and a flange extends outward from an upper end of the main body; and a clamp for fixing the battery to the carrier, wherein an upper surface of the brim is an inclined surface that extends downward and outward, the clamp includes a first contacting part that comes into contact with the inclined surface positioned at one end in a first direction of the battery and presses a bottom of the battery against the carrier, a first standing part standing from the first contacting part, and a fastening part extending from the first standing part so as to be overlapped with the flange and fastened to the flange at a position outside the battery in the first direction, a first contacting part that comes into contact with the inclined surface positioned at one end in a first direction of the battery and presses a bottom of the battery against the carrier, a first standing part standing from the first contacting part, and a fastening part extending from the first standing part so as to be overlapped with the flange and fastened to the flange at a position outside the battery in the first direction, wherein a normal line of the inclined surface passing through a contact point (Pc) between the inclined surface and the first contacting part passes inside a fixing point (Ps) where the fastening part is fixed to the flange so as to be positioned on a battery side,