A packaging body (1,10,20,30,40,50) superimposing sheet members, comprising: a sticking region (5a,5b,5c, 15a, 15b,25b,25b,35a,35b,45a,45b,55a,55b,3, 13,23,33,43,53) formed on an outer periphery of superimposed sheet members, an opening (3,13,23,33,43,53) in at least one part of the sticking region (5a,5b,5c, 15a, 15b,25b,25b,35a,35b,45a,45b,55a,55b,3, 13,23,33,43,53), and a seal portion sealing the opening (3,13,23,33,43,53), wherein the seal portion has a wide-angle, substantially V-shaped angular shape bent so as to be convex toward the upper side of the packaging body (1,10,20,30,40,50), and includes a first sticking portion (3b,13c,23b,33b,43b,53b) having a mountain-like angular shape connected to the upper ends of the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b,3,13,23,33,43,53), characterized in that the seal portion further includes: a first non-sticking portion (7a,17b,27a,37a,47a,57a) formed in a mountain-like angular shape adjacent to an outside of the first sticking portion (3b,13c,23b,33b,43b,53b) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b), and a second sticking portion (3a,13b,23a,33a,43a,53a) formed in a mountain-like angular shape adjacent to an outside of the first non-sticking portion (7a,17b,27a,37a,47a,57a) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b) and the first sticking portion (3b,13c,23b,33b,43b,53b), wherein both ends of the second sticking portion (3a,13b,23a,33a,43a,53a) are spaced apart from the first sticking portion (3b,13c,23b,33b,43b,53b). a sticking region (5a,5b,5c, 15a, 15b,25b,25b,35a,35b,45a,45b,55a,55b,3, 13,23,33,43,53) formed on an outer periphery of superimposed sheet members, an opening (3,13,23,33,43,53) in at least one part of the sticking region (5a,5b,5c, 15a, 15b,25b,25b,35a,35b,45a,45b,55a,55b,3, 13,23,33,43,53), and a seal portion sealing the opening (3,13,23,33,43,53), wherein the seal portion has a wide-angle, substantially V-shaped angular shape bent so as to be convex toward the upper side of the packaging body (1,10,20,30,40,50), and includes a first sticking portion (3b,13c,23b,33b,43b,53b) having a mountain-like angular shape connected to the upper ends of the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b,3,13,23,33,43,53), characterized in that the seal portion further includes: a first non-sticking portion (7a,17b,27a,37a,47a,57a) formed in a mountain-like angular shape adjacent to an outside of the first sticking portion (3b,13c,23b,33b,43b,53b) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b), and a second sticking portion (3a,13b,23a,33a,43a,53a) formed in a mountain-like angular shape adjacent to an outside of the first non-sticking portion (7a,17b,27a,37a,47a,57a) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b) and the first sticking portion (3b,13c,23b,33b,43b,53b), wherein both ends of the second sticking portion (3a,13b,23a,33a,43a,53a) are spaced apart from the first sticking portion (3b,13c,23b,33b,43b,53b). a first non-sticking portion (7a,17b,27a,37a,47a,57a) formed in a mountain-like angular shape adjacent to an outside of the first sticking portion (3b,13c,23b,33b,43b,53b) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b), and a second sticking portion (3a,13b,23a,33a,43a,53a) formed in a mountain-like angular shape adjacent to an outside of the first non-sticking portion (7a,17b,27a,37a,47a,57a) spaced apart from the sticking region (5a,5b,5c,15a,15b,25b,25b,35a,35b,45a,45b,55a,55b) and the first sticking portion (3b,13c,23b,33b,43b,53b), wherein both ends of the second sticking portion (3a,13b,23a,33a,43a,53a) are spaced apart from the first sticking portion (3b,13c,23b,33b,43b,53b).