An inertial measurement unit includes: a substrate; a sealing member; a first inertial sensor module including a first inertial sensor and a first package accommodating the first inertial sensor; and a second inertial sensor module including a second inertial sensor and a second package accommodating the second inertial sensor. A material of the first package includes a resin. A material of the second package is an inorganic material. The first inertial sensor module is accommodated in a space between the substrate and the sealing member and thus airtightly sealed therein. The second inertial sensor module is provided outside the space.