An envelope sheet (P1, P1A) used when manufacturing an envelope, comprising: n rectangular component sheets (47, 49, 53, 75), wherein n is an integer of three or more; and n-1 folding lines (51, 55, 73) for consecutively connecting the n component sheets (47, 49, 53, 75) along an envelope unfolding direction, wherein each folding line consecutively connects adjacent component sheets, wherein a first component sheet serves as one of a front sheet (Mb) and a back sheet (Ma) of the envelope, a second component sheet serves as the other one of the front sheet (Mb) and the back sheet (Ma) of the envelope, one end of the first component sheet in the envelope unfolding direction serves as an openable and closable flap of the envelope, a first coating part and a second coating part are respectively formed along the envelope unfolding direction on both side fringes of an envelope inner side of the first component sheet to a third component sheet in an orthogonal direction orthogonal to the envelope unfolding direction, and another coating part for closing the flap is formed along the orthogonal direction on a region which is a part of an envelope outer side of the third component sheet and which contacts the flap when the envelope sheet (P1, P1A) is folded along the folding lines (51, 55, 73), characterized in that the first coating part and the second coating part are coated with pressure-sensitive adhesive, whereas the other coating part is coated with an adhesive other than pressure-sensitive adhesive; and a first cutout part and a second cutout part, which respectively extend in an extension direction of the first coating part and the second coating part, are respectively formed on both side fringes in the orthogonal direction in the third component sheet. n rectangular component sheets (47, 49, 53, 75), wherein n is an integer of three or more; and n-1 folding lines (51, 55, 73) for consecutively connecting the n component sheets (47, 49, 53, 75) along an envelope unfolding direction, wherein each folding line consecutively connects adjacent component sheets, wherein a first component sheet serves as one of a front sheet (Mb) and a back sheet (Ma) of the envelope, a second component sheet serves as the other one of the front sheet (Mb) and the back sheet (Ma) of the envelope, one end of the first component sheet in the envelope unfolding direction serves as an openable and closable flap of the envelope, a first coating part and a second coating part are respectively formed along the envelope unfolding direction on both side fringes of an envelope inner side of the first component sheet to a third component sheet in an orthogonal direction orthogonal to the envelope unfolding direction, and another coating part for closing the flap is formed along the orthogonal direction on a region which is a part of an envelope outer side of the third component sheet and which contacts the flap when the envelope sheet (P1, P1A) is folded along the folding lines (51, 55, 73), characterized in that the first coating part and the second coating part are coated with pressure-sensitive adhesive, whereas the other coating part is coated with an adhesive other than pressure-sensitive adhesive; and a first cutout part and a second cutout part, which respectively extend in an extension direction of the first coating part and the second coating part, are respectively formed on both side fringes in the orthogonal direction in the third component sheet.