1. A risk calculation apparatus comprising: a moving object risk calculation unit that calculates, on the basis of a risk due to objects at each of a plurality of points set in the vicinity of a host vehicle, a total value at all of the points for a moving object risk due to movable objects at each of the points, wherein the moving object risk calculation unit calculates the total value of the moving object risk at all of the points by subtracting a total value at all of the points for a fixed object risk due to immovable objects, which are fixed at each of the points, from a total value at all of the points for a risk due to objects at each of the points.