Patent ID: 8365694

Claim:
A spark plug, comprising: a spark plug main body including: a cylindrical metal shell, a cylindrical insulator accommodated in the metal shell, a center electrode extending in an axial direction and accommodated in the insulator, a ground electrode having one end that is joined to a first end side of the metal shell and a free end that is disposed so as to form a gap with a front end portion of the center electrode, and a removing-tool engagement portion formed on an outer face of a second end side of the metal shell, said removing-tool engagement portion engaging with a tool for removing the spark plug main body from the internal-combustion engine by application of a force to the spark plug main body in the axial direction without rotation of the spark plug main body; and a cylindrical pressing member having a tool engagement portion in an upper portion, and a male thread formed on an outer circumferential face of the pressing member for engagement with a female thread of a plug hole of an internal-combustion engine to fix the spark plug main body to the internal combustion engine.