The invention relates to a bicycle trailer for transporting people with at least one seat device (10), which comprises at least one seat section (12) and at least one back support section (14) and at least one belt restraint system for a transporting person, the belt restraint system has at least two shoulder straps (16a, 16b, 16a ', 16b'). A tensioning device (40) is provided which is designed such that the at least two shoulder straps (16a, 16b, 16a ', 16b') can be tensioned simultaneously by actuating an actuating element (42).
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