Kinesin-2 family proteins, including KIF3A, KIF3B, KIF3C and KIF17, are members of the kinesin superfamily motor proteins, which transport various proteins and vesicles in the cell and play diverse biological functions. Recently, studies on members of kinesin-2 family proteins suggest that they play fundamental roles during ciliary transport, whose defects can lead to abnormal cilia development, the major cause of human ciliopathies. In this review, we will summarize the functions of this motor protein family during ciliogenesis and focus mainly on their roles in the development of model organisms.