Patent ID: 6935799

Claim:
An instrument comprising: a stick-like object receiving member for receiving a stick-like object, comprising: a cylindrical side portion which engages with at least a part of the outer peripheral surface of the stick-like object and surrounds at least a part of the outer peripheral surface of the stick-like object, and a bottom portion which closes one end of said cylindrical side portion, and the stick-like object receiving member having safety precautions, wherein a slit is formed in said cylindrical side portion and bottom portion so as to penetrate said cylindrical side portion and bottom portion in the axial direction to provide an air passage of the stick-like object receiving member; and a barrel comprising: a cylindrical casing having one end within which said stick-like object receiving member is detachably mounted; an end face to which a collar portion of the stick-like object receiving member is locked; an inner peripheral surface which engages with at least part of said cylindrical side portion of the stick-like object receiving member and surrounds the outer peripheral surface of said cylindrical side portion; and a step portion formed on said inner peripheral surface so as to be separated from said bottom portion of the stick-like receiving number and including an opening, wherein a gap is formed between said step portion and said bottom portion that communicates with the slit and forms an air passage together with the slit and the opening.