To provide a secondary battery pack that reduces the number of parts and simplifies the cooling structure of a cell.SOLUTION: A secondary battery pack 10 includes 28 flat laminated cells 20, 14 cooling plates 30, and a housing 40. Each of the cooling plates 30 includes a contact portion 32 and a protrusion 34, and the contact portion 32 is arranged between two adjacent laminated cells 20a and 20b from among the 28 laminated cells 20, and the protrusion 34 extends from the contact portion 32. The housing 40 includes a bottom wall 42 and a protective wall 44, the bottom wall 42 has 14 through holes 42a, and a part of the protrusions 34 of each of the cooling plates 30 penetrates each through hole 42a. The protrusion 34 of each of the cooling plates 30 includes a protrusion 34a, which protrudes from each through hole 42a of the bottom wall 42. The protective wall 44 protects the protrusion 34a of each cooling plate 30 to form an air flow path 44a, and the air flowing through the air flow path 44a cools the protrusion 34a.SELECTED DRAWING: Figure 1