To provide an envelope which is prepared in a small number of processes and is opened easily by hand.
The envelope 1 includes a lid piece 4 extending from a bag-like body 2 and closing an opening 3, a first perforation 5 formed along the opening 3 at the boundary between the bag-like body 2 and the lid piece 4 and a second perforation 6 formed along the first perforation 5 at the lid piece 4. Both of the first perforation 5 and the second perforation 6 are formed from end to end of the envelope 1. A notch 7 is formed along the first perforation 5 at least at one end of an area 8 surrounded by the first perforation 5 and the second perforation 6. The envelope 1 further includes an adhesive tape 9 attached on the lid piece 4 to adhere the bag-like body 2 to the lid piece 4 and a released paper 10 attached to the adhesive tape 9 to protect the adhesive tape 9.
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