PROBLEM TO BE SOLVED: To provide a medical clamp tool in which an inclined plate is prevented from rolling when the leading edge of the inclined plate is pressed down to make the leading edge engage a lock part of an upright plate.SOLUTION: A medical clamp tool according to the present invention comprises: an inclined plate 4 extending obliquely upward from, via a curved part 3, one length-wise end side of a nearly rectangular bottom part 2; and an upright plate 5 provided opposite the inclined plate 4 and rising from, via a curved part 3', from the other length-wise end side of the bottom part 2, wherein when a leading edge of the inclined plate is pressed down to and engaged with a lock part 6 which continues to a steeply inclined part 5' provided on an upper inner surface of the upright plate 5, a tube K inserted through openings each formed in the curved part of the inclined plate 4 and in the curved part of the upright plate can be held by projections each formed on opposing respective faces of the inclined plate and the bottom part. The medical clamp tool further comprises an arcuate beam 12, which is two-pronged toward the bottom part, between the base part 10 of the projection on the inclined plate 4 and the upper surface of the bottom part near the upright plate 5.SELECTED DRAWING: Figure 1