Abstract: A car seat headrest structure with multipart supporting effect includes a headrest main body and a support section. The main body is defined with a middle section, two lateral sections, an upper section and a lower section. The support section includes two lateral support sections positioned on the two lateral sections and a lower support section positioned on the lower section of the main body. The lower support section and the lateral support sections are flexible or elastic protrusion structures corresponding to the cervical vertebrae portion and the head of a user. The lateral support sections, the lower support section and the middle section of the main body together define an embracing/supporting section. In accordance with ergonomics, the support section can truly protect and support the head and the cervical vertebrae portion of the user according to the actual use requirements of the user.