Collapsible ski, which in its assembled i.e. functional state comprises a front area with a tip, which is smoothly bent in a direction apart from the ground, a rear area with a tail, which is either at least approximately flat or smoothly bent away from the ground, as well as a central area, which is foreseen form mounting of a ski binding, which consists of a front assembly and a rear assembly and is suitable for attachment of each ski shoe onto a top surface of the ski, which is during the use faced apart from the ground while the opposite sliding surface of the ski, which is during the use faced towards the ground, is furnished with ski edges (96, 97), which extend along at least the majority of the ski length, and wherein such ski consists of a front part and a rear part, which are connected with each other and can be pivoted around a geometric axis, which extends parallel with said sliding surface, and which parts, when aligned, can be fixed in such position by means of a platform, which is foreseen for attachment of the front assembly and the rear assembly of said ski binding, and wherein said platform is on its bottom surface, which is faced towards said front part and rear part of the ski, furnished with a centrally located cavity, in which two diametrically apart from each other arranged recesses (351, 352) are arranged, which are adapted to cooperate with first and second arresting protrusions (511, 512), of which the first one is available on the front part, and the other one on the rear part of the ski, characterized in that said platform is interconnected with the front part of the ski in a non detachable manner by means of a connecting plate, which is mounted on the top surface of the ski and rotatable around a geometric axis, which extends perpendicularly with respect to said top surface of the ski, and in that said platform is in its front area adjacent to the front assembly of the ski binding furnished with a third arresting protrusion in form of a part of circumference of a circle, and in the rear area adjacent to the rear assembly of the ski binding with a fourth arresting protrusion also in form of a part of circumference of a circle, and in that a first retaining protrusion is available on the top surface of the front part of the ski, which is located at appropriate distance apart from said geometric axis, around which the platform can be rotated, namely in a direction towards to the ski tip, wherein said first retaining protrusion comprises a groove in form of a part of circumference of a circle, which is adapted to cooperate at least with the third arresting protrusion on the front area of said platform, while a second retaining protrusion is available on the top surface of the ski, which is located at appropriate distance apart from said first retaining protrusion in a direction towards to the ski tip and is also furnished with a groove in form of a part of circumference of a circle, which is adapted to cooperate at least with the fourth arresting protrusion on the rear area of the platform, and moreover, a third retaining protrusion is available on the top surface of the rear part of the ski at appropriate distance from the geometric axis, around which said front part and said rear part of the ski can be pivoted, wherein said third retaining protrusion is furnished with a groove also in form of a part of circumference of a circle, which is adapted to cooperate at least with the fourth arresting protrusion on the rear area of the platform.