A bend-open package includes a sealant without unsealing an opening until the package is bent to a predetermined bend angle or less to prevent leakage of the content in a package body. A method for manufacturing the bend-open package includes preparing a sheet member for a bend-open package, including in sequence, (a) forming cuts in the surface of a sheet base, and (b) press-bonding sealants press-cut from a sealant base to the surface of the sheet base to cover the cuts. The steps include embedding a periphery of the sealant in the surface of the sheet member by a predetermined depth, and forming a protrusion having a height smaller than a thickness of the sealant protruding outwardly from the surface of the sheet member along the entire periphery of the sealant.