PROBLEM TO BE SOLVED: To provide a cart with a carrier for a pet, which can increase the degree of freedom of setting of dimensions of the carrier for the pet.SOLUTION: A cart body 20 of a cart with a carrier for a pet includes a carrier support 50 that is loaded with an upper edge frame body 75A of a carrier 70A. A front/back dimension of the carrier 70A is smaller than a front/back dimension of the carrier support 50. Thus, a front/back gap G is formed between the carrier 70A and the carrier support 50. A pocket member 101 is arranged in the front/back gap G.