An arrangement in a shelf, the arrangement comprising: - two opposing vertical side walls, the two opposing vertical side walls comprising a bottom end, a top end, a first side edge, a second side edge and a side wall surface provided between the bottom and top ends (71, 72) and the first and second side edges (73, 74); - one or more side wall apertures provided to the side wall surfaces of the two opposing vertical side walls and extending into the vertical side walls; - one or more shelf supports, the one or more shelf supports comprising a pin part arranged inside the side wall aperture, a support part protruding outside of the side wall aperture from the side wall surface and a stopping surface provided to the support part, the pin part protruding from the stopping surface, the stopping surface being placed against the side wall surface when the pin part is inserted into the side wall aperture; and - a horizontal shelf plate provided between the two opposing vertical side walls and supported on the support parts of the one or more shelf supports, wherein - the one or more side wall apertures extend from the side wall surfaces into the vertical side walls in an aperture angle in relation to a direction perpendicular to the side wall surface; and - the pin part extends into the side wall aperture from the stopping surface provided to the support part in a pin angle in relation to the support part, the support part comprises an upper support surface (34, 37) arranged to be positioned towards the shelf plate, and the pin part extends from the stopping surface parallel to the upper support surface (34, 37) and in a first pin angle in relation to the direction perpendicular to the stopping surface when the shelf support is viewed from the support part towards the pin part, the support part is further provided with a protrusion protruding upwards from the upper support surface (34, 37), the protrusion is provided to the support part at a distance from the stopping surface; and the one or more side wall surfaces comprise at least one pair of adjacent side wall apertures, the pair of adjacent side wall apertures comprise a first side wall aperture and a second side wall aperture, and that: - the first side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the second side edge of the vertical side wall, and the second side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the first side edge of the vertical side wall; or - the first side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the first side edge of the vertical side wall, and the second side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the second side edge of the vertical side wall. - two opposing vertical side walls, the two opposing vertical side walls comprising a bottom end, a top end, a first side edge, a second side edge and a side wall surface provided between the bottom and top ends (71, 72) and the first and second side edges (73, 74); - one or more side wall apertures provided to the side wall surfaces of the two opposing vertical side walls and extending into the vertical side walls; - one or more shelf supports, the one or more shelf supports comprising a pin part arranged inside the side wall aperture, a support part protruding outside of the side wall aperture from the side wall surface and a stopping surface provided to the support part, the pin part protruding from the stopping surface, the stopping surface being placed against the side wall surface when the pin part is inserted into the side wall aperture; and - a horizontal shelf plate provided between the two opposing vertical side walls and supported on the support parts of the one or more shelf supports, - the one or more side wall apertures extend from the side wall surfaces into the vertical side walls in an aperture angle in relation to a direction perpendicular to the side wall surface; and - the pin part extends into the side wall aperture from the stopping surface provided to the support part in a pin angle in relation to the support part, the support part comprises an upper support surface (34, 37) arranged to be positioned towards the shelf plate, and the pin part extends from the stopping surface parallel to the upper support surface (34, 37) and in a first pin angle in relation to the direction perpendicular to the stopping surface when the shelf support is viewed from the support part towards the pin part, the support part is further provided with a protrusion protruding upwards from the upper support surface (34, 37), the protrusion is provided to the support part at a distance from the stopping surface; and - the first side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the second side edge of the vertical side wall, and the second side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the first side edge of the vertical side wall; or - the first side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the first side edge of the vertical side wall, and the second side wall aperture extends parallel to the horizontal cross-sectional plane and in the aperture angle towards the second side edge of the vertical side wall.