BATTERY PACK

A battery pack includes a cylindrical secondary battery and a heat absorbing member, and an exterior body of the heat absorbing member accommodates a heat absorbing agent between a first inner resin layer L1a and a second inner resin layer. A flange portion of the exterior body has an inner resin continuous portion in which the first inner resin layer and the second inner resin layer are continuous over the entire circumference. In a sectional shape of the heat absorbing member, the inner resin continuous portion includes a first continuous portion located inward of a first metal layer and a second metal layer, and a second continuous portion, a third continuous portion, and a fourth continuous portion each having a portion exposed to outside of the exterior body. The heat absorbing member is arranged in an orientation in which the first continuous portion is closer to an end of the secondary battery than the second continuous portion, the third continuous portion, and the fourth continuous portion in an axial direction of the secondary battery.