The present invention relates to a secondary battery, a method for manufacturing the same, and a pressing block for manufacturing the secondary battery. The method for manufacturing the secondary battery according to the present invention comprises a forming step of forming a pouch sheet to form an accommodation part in which an electrode assembly is accommodated, a folding step of folding the pouch sheet with respect to a folding part so that the electrode assembly is accommodated in the accommodation part, and the accommodation part is blocked from the outside to form a battery case, and an anti-wrinkle step of forming an anti-wrinkle bending part on an outer shell to prevent wrinkles from being generated on the outer shell of the folded pouch sheet.