Disclosed are an elliptical chainring capable of fine-angle variation, and a crankset of a bicycle comprising the same. The crankset of a bicycle according to the first embodiment of the present invention, comprises: a crank shaft; an asymmetric elliptical chainring which is fitted and fixed in the crank shaft, which has a plurality of first to fourth crank arm fixing holes formed at predetermined spaces, and which has a plurality of first fine-adjustment holes and plurality of second fine-adjustment holes formed on the top and bottom thereof; a first adaptor arranged on the top of the plurality of first to fourth crank arm fixing holes, the plurality of first fine-adjustment holes, and the plurality of second fine-adjustment holes of the asymmetric elliptical chainring so as to support the asymmetric elliptical chainring; a second adaptor arranged on the top of the fifth and sixth crank arm fixing holes and a plurality of third fine-adjustment holes of the first adaptor so as to support the first adaptor; a crank arm; and a plurality of chainring bolts selectively and respectively fixed in the plurality of first fine-adjustment holes and plurality of second adjustment holes. A worker may finely adjust the angle between the asymmetric elliptical chainring and the crank arm by changing the positions of the plurality of chainring bolts ( Fig. 1 ).