An enveloping device (1) capable of successively performing a process for producing an envelope and inserting a content into the envelope at high speed comprises: film feeding means (2) for feeding a film (7) wound in the form of a roll in a shape overlapping in two folds in the middle of a width direction indicated by an arrow W; an envelope making device (3) for successively forming an envelope by fusing the middle of a longitudinal direction of the film (7) overlapping in two folds while conveying the film; envelope conveying means (5) which is a conveyor for conveying a plurality of envelopes (8) while arranging the envelopes in a line; and an inserting device (6) for inserting contents (9) into the envelopes (8) conveyed by the envelope conveying means (5).
