A child seat includes a seat shell having an anchor strap made of a continuous web material, and a lock. The anchor strap has two end portions, and an intermediate portion between the two end portions. The two end portions are located at the rear of the seat shell and are respectively provided with fasteners operable to attach with an anchor structure of a vehicle, and the intermediate portion is folded over to define two segments of the web material. The lock can releasibly clamp a portion of the two segments, the intermediate portion extending outward from the lock to define a looped tab. Moreover, an interior of the seat shell can have a strap guiding structure including two sidewalls between which is defined a passage for the web material. The two sidewalls are substantially close to each other to prevent twisting of the web material.