A wheel of a golf cart includes a connecting member, a rotary main body, and an axle for the rotary main body; the connecting member can be detached from a support part of a main frame of the golf cart for reducing dimension of the cart in packaging and transportation; the connecting member has an engaging element pivoted thereto and biased to an engaging position by means of a torsion spring; the axle can be easily separated from the rotary main body for maintenance and replacement; the axle has an annular engaging recess thereon, and can be inserted in the connecting member to engage the engaging element for connecting the rotary main body to the connecting member; thus, the rotary main body can be easily separated from the main frame of the golf cart together with the axle after the engaging element is pivoted such as to disengage the axle.