A child safety seat includes a seating base, an armrest base, and a storage structure. The armrest base is disposed on a side of the seating base. The storage structure is pivotally connected to the armrest base. A first storage space and a second storage space are formed in the storage structure. The first storage space and the second storage space are located on different planes of the storage structure. The storage structure is lay down at a side of the armrest base that is located substantially on the same plane with the seating base and an opening of the first storage space faces up when the storage structure is in a first position. The storage structure is standing on the side of the armrest base and an opening of the second storage space of the storage structure faces up when the storage structure is in a second position.