Abstract: A child seat is composed of a base, which can be fastened on a vehicle seat, as well as of a removable shell part. In order to be able to carry out an inclination adjustment of the shell part with respect to the base also during the drive without any safety risk, a connection element is provided in the form of a bolt which can take up three positions. In the locking position with the inclination of the shell part is fixed, the bolt penetrates a locking strip with several detent openings. In the securing position, the bolt no longer engages in the locking strip so that the inclination of the shell part can be changed. However, the bolt still reaches behind a stop which prevents a release of the shell part from the base. The shell part can be removed from the base only in the removal position of the bolt.