A method for producing a secondary battery, comprising: an electrode plate placing step of placing a predetermined number of positive electrode plates or negative electrode plates on a positive electrode plate or negative electrode plate cassette member; an electrode plate supply step of batchwise supplying the predetermined number of positive electrode plates or negative electrode plates placed on the positive electrode plate or negative electrode plate cassette member to an electrode plate conveying member (20A, 20B) for positive electrode plates or negative electrode plates by pressing edge parts of the positive electrode plates or the negative electrode plates by means of a pressing member; a separator arrangement step of arranging a plurality of guide members in two vertical rows (12A, 12B) in a zigzag arrangement with respect to each other and of disposing a separator between the two vertical rows of the guide members; a zigzag folding step of folding the separator zigzag by crossing the guide members arranged in the two vertical rows with the separator disposed between them in a horizontal direction into a zigzag arrangement such as to fold the separator zigzag in the vertical direction; a multilayer body formation step of inserting the positive electrode plates placed on the electrode plate conveying member for positive electrode plates and the negative electrode plates placed on the electrode plate conveying member for negative electrode plates into respective furrows of the zigzag-folded separator to form a multilayer body having the positive electrode plates and the negative electrode plates superposed alternately via the separator; a withdrawal step of withdrawing the guide members from inside the respective furrows of the separator; and a pressing step of pressing the multilayer body in a direction in which the positive electrode plates and the negative electrode plates are stacked. an electrode plate placing step of placing a predetermined number of positive electrode plates or negative electrode plates on a positive electrode plate or negative electrode plate cassette member; an electrode plate supply step of batchwise supplying the predetermined number of positive electrode plates or negative electrode plates placed on the positive electrode plate or negative electrode plate cassette member to an electrode plate conveying member (20A, 20B) for positive electrode plates or negative electrode plates by pressing edge parts of the positive electrode plates or the negative electrode plates by means of a pressing member; a separator arrangement step of arranging a plurality of guide members in two vertical rows (12A, 12B) in a zigzag arrangement with respect to each other and of disposing a separator between the two vertical rows of the guide members; a zigzag folding step of folding the separator zigzag by crossing the guide members arranged in the two vertical rows with the separator disposed between them in a horizontal direction into a zigzag arrangement such as to fold the separator zigzag in the vertical direction; a multilayer body formation step of inserting the positive electrode plates placed on the electrode plate conveying member for positive electrode plates and the negative electrode plates placed on the electrode plate conveying member for negative electrode plates into respective furrows of the zigzag-folded separator to form a multilayer body having the positive electrode plates and the negative electrode plates superposed alternately via the separator; a withdrawal step of withdrawing the guide members from inside the respective furrows of the separator; and a pressing step of pressing the multilayer body in a direction in which the positive electrode plates and the negative electrode plates are stacked.