A cell module comprising: a plurality of cylindrical batteries; and a holder (2, 20) holding the plurality of cylindrical batteries in a parallel posture, wherein the holder (2, 20) includes: a holder body (3, 23) having holding spaces (13, 31-33) for arranging the plurality of cylindrical batteries at fixed positions; and a sub holder (4, 24) stacked on the holder body (3, 23), the holder body (3, 23) includes stopper portions (5, 25), the stopper portions (5, 25) each being deformed toward a surface of a corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces (13, 31-33), the sub holder (4, 24) includes push rods (6, 26), the push rods (6, 26) each pushing a corresponding one of the stopper portions (5, 25) to a corresponding one of the plurality of cylindrical batteries when the sub holder (4, 24) is coupled to the holder body (3, 23), and the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) thrusts a corresponding one of the stopper portions (5, 25) against a corresponding one of the plurality of cylindrical batteries and presses a surface of the corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces, and wherein the cell module has a structure in which the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) is inserted into a back surface of a corresponding one of the stopper portions (5, 25), press each of the stopper portions (5, 25) from the back surface, and thrusts and presses a front surface of the corresponding one of the stopper portions (5, 25) against the corresponding one of the plurality of cylindrical batteries. a plurality of cylindrical batteries; and a holder (2, 20) holding the plurality of cylindrical batteries in a parallel posture, wherein the holder (2, 20) includes: a holder body (3, 23) having holding spaces (13, 31-33) for arranging the plurality of cylindrical batteries at fixed positions; and a sub holder (4, 24) stacked on the holder body (3, 23), the holder body (3, 23) includes stopper portions (5, 25), the stopper portions (5, 25) each being deformed toward a surface of a corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces (13, 31-33), the sub holder (4, 24) includes push rods (6, 26), the push rods (6, 26) each pushing a corresponding one of the stopper portions (5, 25) to a corresponding one of the plurality of cylindrical batteries when the sub holder (4, 24) is coupled to the holder body (3, 23), and the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) thrusts a corresponding one of the stopper portions (5, 25) against a corresponding one of the plurality of cylindrical batteries and presses a surface of the corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces, and wherein the cell module has a structure in which the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) is inserted into a back surface of a corresponding one of the stopper portions (5, 25), press each of the stopper portions (5, 25) from the back surface, and thrusts and presses a front surface of the corresponding one of the stopper portions (5, 25) against the corresponding one of the plurality of cylindrical batteries. a holder body (3, 23) having holding spaces (13, 31-33) for arranging the plurality of cylindrical batteries at fixed positions; and a sub holder (4, 24) stacked on the holder body (3, 23), the holder body (3, 23) includes stopper portions (5, 25), the stopper portions (5, 25) each being deformed toward a surface of a corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces (13, 31-33), the sub holder (4, 24) includes push rods (6, 26), the push rods (6, 26) each pushing a corresponding one of the stopper portions (5, 25) to a corresponding one of the plurality of cylindrical batteries when the sub holder (4, 24) is coupled to the holder body (3, 23), and the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) thrusts a corresponding one of the stopper portions (5, 25) against a corresponding one of the plurality of cylindrical batteries and presses a surface of the corresponding one of the plurality of cylindrical batteries arranged in a corresponding one of the holding spaces, and wherein the cell module has a structure in which the sub holder (4, 24) is configured to be coupled to the holder body (3, 23), such that each of the push rods (6, 26) is inserted into a back surface of a corresponding one of the stopper portions (5, 25), press each of the stopper portions (5, 25) from the back surface, and thrusts and presses a front surface of the corresponding one of the stopper portions (5, 25) against the corresponding one of the plurality of cylindrical batteries.