In order to enhance fixability and stability of a bone plate (1) to a tibia, a bone plate of the present invention includes: a band-shaped body section (1a) that is fixed, along a longitudinal direction of the tibia, to an inner side surface of a tibia (X) at a position lower than a notch in the tibia (X)； a transverse section (1b) that is fixed, along a direction intersecting the longitudinal direction of the tibia, to a position higher than the notch； a joining section (1c) for joining the body section (1a) and the transverse section (1b)； and a plurality of screw holes (5, 6, and 7) in the body section (1a), the transverse section (1b), and the joining section (1c), said screw holes passing therethrough in a plate thickness direction in a manner spaced apart from one another, wherein the body section (1a), the joining section (1c), and the transverse section (1b) have a curved surface shape twisted about an axial line in the longitudinal direction of the tibia (X), a first plane (±) on which the axial line of a screw hole (7) in the joining section (1c) is disposed and a second plane (²) on which the axial line of a screw hole (5a) in the body section (1a) 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 (1) and the first plane (±) and the second plane (²) are predetermined angles, and an axial line (A) and an axial line (B) are at twisted positions.
