An inertial measurement device includes: a first case and a second case; a board that is disposed in a space formed by the first case and the second case, that includes a first surface and a second surface, and in which a first inertial sensor is disposed at the first surface; a first filling material configured to fill between the first surface of the board and the first case and between the first inertial sensor and the first case; and a second filling material configured to fill between the second surface of the board and the second case.