To provide a paper container for liquid having a pour spout, which is easy to hold by hand, of which the unsealing and re-sealing are easy, and of which the carton deforms so that pouring can be easily performed.

An upside-down square cylinder trapezoidal shape carton is formed using a laminated body of which the base material is a paper board, both surfaces of which comprise a thermoplastic resin layer. For such a carton, the leading end of an ear part M formed by folding an ear forming panel of a head part at a diagonal ruled line, is easily separated along a weakened line to form a pour spout C, and the carton can be deformed to an optimum discharging shape by newly providing longitudinal ruled lines, which are provided on the ear part M, and ruled lines (h), (i) to partition an isosceles-triangle, which are provided at an upper part of a body part side wall panel 3. In addition, by bending downward a ruled line (f) which connects the body part side wall panel 3 and the ear part M, at the center, the ear part M is folded into the original position, and a re-sealing becomes possible.