To solve the following problem: a drawer fitted with a drawer rail is excellent in sliding performance, but strongly hits a back panel of furniture and breaks the back panel when closed with strength or the drawer opens with great momentum, so that the furniture installed with drawer rail is provided with a pull-in device for buffering the momentum when closed; yet the pull-in device cannot precisely be installed at a prescribed position but also it takes labor and time to install it.

Engaging parts are formed at two positions on the drawer rail, engaging parts are formed at two positions in the pull-in device, and by engaging the engaging parts, the pull-in device can be easily installed at a prescribed position.