A rotary electric shaver , comprising: a main body having a grip part and a blade setting base ; a motor built in the main body and connected to a first driven shaft ; and a head connected to the blade setting base , wherein in the blade setting base , a plurality of second driven shafts are connected to the first driven shaft , the head has a setting part in which a plurality of blade units are disposed, and a blade frame that holds the setting part , each of the blade units has an outer blade part and an inner blade part , the inner blade part has an inner blade member in which a plurality of blade edges are formed in a circumferential direction, and a base part joined to the inner blade member , the second driven shaft is connected to the base part , and the inner blade member is configured to rotate around an axis (P1) passing through the second driven shaft , the outer blade part has an annular outer blade member having a sliding contact surface with which the blade edge comes into sliding contact and having a plurality of slits formed in the circumferential direction, a disk-shaped cover disposed inside the annular outer blade member, two to six balls disposed in the outer blade part , and a support that supports the two to six balls , the cover has two to six windows , wherein a part of each of the two to six balls surrounded by the cover and the support protrudes from a corresponding window of the two to six windows, and wherein each of the two to six windows has a smaller diameter than the corresponding ball in the two to six balls , and all of the two to six balls are disposed at positions deviated from the axis (P1) passing through the second driven shaft . a main body having a grip part and a blade setting base ; a motor built in the main body and connected to a first driven shaft ; and a head connected to the blade setting base , wherein in the blade setting base , a plurality of second driven shafts are connected to the first driven shaft , the head has a setting part in which a plurality of blade units are disposed, and a blade frame that holds the setting part , each of the blade units has an outer blade part and an inner blade part , the inner blade part has an inner blade member in which a plurality of blade edges are formed in a circumferential direction, and a base part joined to the inner blade member , the second driven shaft is connected to the base part , and the inner blade member is configured to rotate around an axis (P1) passing through the second driven shaft , the outer blade part has an annular outer blade member having a sliding contact surface with which the blade edge comes into sliding contact and having a plurality of slits formed in the circumferential direction, a disk-shaped cover disposed inside the annular outer blade member, two to six balls disposed in the outer blade part , and a support that supports the two to six balls , the cover has two to six windows , wherein a part of each of the two to six balls surrounded by the cover and the support protrudes from a corresponding window of the two to six windows, and wherein each of the two to six windows has a smaller diameter than the corresponding ball in the two to six balls , and all of the two to six balls are disposed at positions deviated from the axis (P1) passing through the second driven shaft . <EOS>