BATTERY PACK

A battery pack (100) includes: a plurality of stacked battery cells (11); and a case body (21) that has a first bottom portion (22) and a first side portion (23) and that accommodates the plurality of battery cells (11), the first bottom portion (22) being a portion on which the plurality of battery cells (11) are placed, the first side portion (23) rising from the first bottom portion (22). A coolant path (31) through which coolant flows is provided inside the first side portion (23).