A bone plate (1) is provided with: a strip-shaped main-body portion (1a) that is secured, along a longitudinal direction of a tibia, to an oblique anterior inner surface of the tibia below a cut formed in an inner surface of the tibia a transverse portion (1b) that is secured to an inner surface of the tibia above the cut along a direction that intersects the longitudinal direction of the tibia and a joining portion (1c) that joins the main-body portion (1a) and the transverse portion (1b), wherein the transverse portion (1b) and the main-body portion (1a) are provided with a plurality of screw holes (5, 6, and 7) that are arrayed with spaces between each other and that pass therethrough in plate-thickness directions.
