Abstract: A device for putt-practice is disclosed. This device has a first casing opened at its opposite ends, with a speed sensor provided at each end of the first casing and a ball inlet formed at one end of the first casing. A second casing, opened at its opposite ends, is axially connected to an end of the first casing, with a transparent window provided at the upper portion of the second casing for guiding a backstroke movement of a putter during an act of putting. This second casing also has a displaying means for displaying a target putting distance preset by a user, a practical backstroke distance of the putter, and putting results after the act of putting.