A bone plate is provided with: a strip-shaped main-body portion 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 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 that joins the main-body portion and the transverse portion, wherein the transverse portion and the main-body portion are provided with a plurality of screw holes that are arrayed with spaces between each other and that pass therethrough in plate-thickness directions.
