A bone plate includes: a band-shaped body section that is fixed along a longitudinal direction of the tibia; a transverse section that is fixed along a direction intersecting the longitudinal direction of the tibia; a joining section for joining the body section and the transverse section; and screw holes. The body section, the joining section, and the transverse section have a curved surface shape, a first plane on which the axial line of a screw hole in the joining section is disposed and a second plane on which the axial line of a screw hole in the body section is disposed are substantially parallel to each other, the angles between a straight line connecting a longitudinal direction upper-end portion and lower-end portion of the bone plate and the first plane and the second plane are predetermined angles, and an axial line and an axial line are at twisted positions.