A rotary electric shaver comprising: an outer blade whose upper surface functions as annular shaving surfaces (22A and 22B) having multiple hair inlets formed therein; and an inner blade that has a plurality of small blades which rotate while coming into sliding contact with a lower surface of the outer blade from below the annular shaving surfaces (22A and 22B), wherein the plurality of small blades are formed so that an inner blade base plate is partially erected, and is disposed in at least two rows on a circumference close to an outer periphery and on a circumference close to an inner periphery, wherein there is provided a movable inner blade that has a plurality of movable small blades which are vertically movable along a front end surface in a rotation direction of the plurality of small blades, with respect to the predetermined plurality of small blades, and wherein the inner blade and the movable inner blade are fixed to an inner blade base in this order from above so as to configure an inner blade assembly using the three components and so as to rotatably drive the inner blade assembly, wherein the inner blade base has a first projection to which the inner blade and the movable inner blade are fitted so as to perform positioning in a radial direction of the inner blade and the movable inner blade, and a second projection to which an outer blade assembly having an outer blade cover fixed to the center of the outer blade is fitted so as to perform positioning in the radial direction of the outer blade assembly, and wherein respective center axes of the first projection and the second projection are arranged so as to be coaxial with a rotation axis of the inner blade assembly, wherein the inner blade base has multiple third projections which are erected radially outward from the first projection, and wherein the inner blade, the movable inner blade, and the inner blade base are fixed by means of caulking in a state where the third projection is inserted from below into a through-hole formed at a corresponding position in a movable inner blade base plate of the movable inner blade and is further inserted from below into a through-hole formed in the inner blade base plate of the inner blade. an outer blade whose upper surface functions as annular shaving surfaces (22A and 22B) having multiple hair inlets formed therein; and an inner blade that has a plurality of small blades which rotate while coming into sliding contact with a lower surface of the outer blade from below the annular shaving surfaces (22A and 22B), wherein the plurality of small blades are formed so that an inner blade base plate is partially erected, and is disposed in at least two rows on a circumference close to an outer periphery and on a circumference close to an inner periphery, wherein there is provided a movable inner blade that has a plurality of movable small blades which are vertically movable along a front end surface in a rotation direction of the plurality of small blades, with respect to the predetermined plurality of small blades, and wherein the inner blade and the movable inner blade are fixed to an inner blade base in this order from above so as to configure an inner blade assembly using the three components and so as to rotatably drive the inner blade assembly, wherein the inner blade base has a first projection to which the inner blade and the movable inner blade are fitted so as to perform positioning in a radial direction of the inner blade and the movable inner blade, and a second projection to which an outer blade assembly having an outer blade cover fixed to the center of the outer blade is fitted so as to perform positioning in the radial direction of the outer blade assembly, and wherein respective center axes of the first projection and the second projection are arranged so as to be coaxial with a rotation axis of the inner blade assembly, wherein the inner blade base has multiple third projections which are erected radially outward from the first projection, and wherein the inner blade, the movable inner blade, and the inner blade base are fixed by means of caulking in a state where the third projection is inserted from below into a through-hole formed at a corresponding position in a movable inner blade base plate of the movable inner blade and is further inserted from below into a through-hole formed in the inner blade base plate of the inner blade.