A medical tube clamp which presses and occludes a flexible medical tube , the medical tube clamp comprising: a first plate on which a first protrusion is formed; a second plate placed opposing the first plate , and on which a second protrusion which presses the medical tube along with the first protrusion is formed; a connecting portion that connects one end of the first plate in a length direction and one end of the second plate in a length direction, and that is elastically deformable so as to allow the first plate and the second plate to be closer to each other; and a locking unit that is formed extending from the first plate toward the second plate , that locks an other end of the second plate in the length direction, and that maintains an occluded state of the medical tube , wherein a pair of sidewalls which extend in a standing manner are formed on both ends in a width direction on the first plate , a biting-prevention piece is formed extending from the other end of the second plate in the length direction to the second protrusion along the length direction on a center in a width direction of the second plate , the biting-prevention piece protruding toward the first plate , a sloped surface is formed on the second plate , the sloped surface being inclined toward the first plate from both ends in the width direction toward the center in the width direction of the second plate , and an inclination angle θ of the sloped surface with respect to the width direction of the second plate is 10° ~ 60°, and characterized in that the sloped surface protrudes beyond the biting-prevention piece toward the first plate at the center in the width direction of the second plate . a first plate on which a first protrusion is formed; a second plate placed opposing the first plate , and on which a second protrusion which presses the medical tube along with the first protrusion is formed; a connecting portion that connects one end of the first plate in a length direction and one end of the second plate in a length direction, and that is elastically deformable so as to allow the first plate and the second plate to be closer to each other; and a locking unit that is formed extending from the first plate toward the second plate , that locks an other end of the second plate in the length direction, and that maintains an occluded state of the medical tube , wherein a pair of sidewalls which extend in a standing manner are formed on both ends in a width direction on the first plate , a biting-prevention piece is formed extending from the other end of the second plate in the length direction to the second protrusion along the length direction on a center in a width direction of the second plate , the biting-prevention piece protruding toward the first plate , a sloped surface is formed on the second plate , the sloped surface being inclined toward the first plate from both ends in the width direction toward the center in the width direction of the second plate , and an inclination angle θ of the sloped surface with respect to the width direction of the second plate is 10° ~ 60°, and characterized in that the sloped surface protrudes beyond the biting-prevention piece toward the first plate at the center in the width direction of the second plate . <EOS>