Connecting device for detachably connecting parts of a wearable support structure. The connecting device comprises a first connecting element, a second connecting element and a blocking unit, wherein said first connecting element is arranged for rigid connection to a first part of said wearable support structure, wherein said second connecting element is arranged for rigid connection to a second part of said wearable support structure, wherein said first connecting element comprises a receiving wall that is at least partly surrounding a receiving space for partly receiving said second connecting element, wherein said blocking unit in a first state thereof blocks detachment of said first connecting element and said second connecting element and wherein in a second state of said blocking unit said first connecting element is detachable from said second connecting element.
