Fan blade assembly of a ceiling fan

A fan blade assembly includes a mounting arm (40,40') with a mounting end (43,43') formed with a plurality of engaging posts (44,44'). A blade member (50) has a plurality of mounting holes (51), each having a larger bore portion (512) and a smaller notch portion (513) divided by a constricted portion (511a). A plurality of elastomeric coupling members (45,45') are sleeved securely on the engaging posts (44,44'), and have shanks (452), and radial outward peripheral flanges (452a). Each coupling member (45,45') is fitted snugly in the notch portion (513) by passing the shank (452) thereinto after the peripheral flange (452a) has been brought to pass through the bore portion (512) to rest on one side of the blade member (50). A cap member (60,60',70,80) has a plurality of engaging plugs (61,61',71,81). Each engaging plug (61,61',71,81) is inserted into and is fitted snugly in the bore portion (512) of the respective mounting hole (51) in such a manner that a guiding portion (611) thereof will gradually be brought to abut against the constricted portion (511a).