Pen with pen cap not easy to be lost

The utility model provides a pen with a pen cap not easy to be lost. Two sides of a pen body are respectively provided with a slide rail, the pen cap comprises two parts of symmetrical cover bodies, and the two parts of cover bodies are respectively clamped on the slide rail at the bottom and fastened at the nape. The benefits are as follows: the pen cap does not detach from the pen body and accordingly, avoids being lost.