The invention relates to a coffin constructed of a biodegradable material and intended particularly for the transport, burial or cremation of pet animals. An object of the invention is to obviate some of the drawbacks of currently available coffins and thereby to enable a functional structure for transporting, burying, or incinerating pets in crematorium. More specifically, the invention is a coffin (1) the material of which is cardboard, having cut thereof a coffin blank which comprises a bottom (2), side walls (3), end walls (4) and sidewall extensions, as well as a lid that comprises a lid member (5, 6) and lid edges (13, 14). The coffin blank is provided with score lines (7) between the bottom (2) and the side walls (3), as well as with score lines (8) between the bottom (2) and the end walls (4), as well as with score lines (9, 10) for folding the sidewall extensions against the end walls (4), the sidewall extensions are adapted for attachment to the end wall (4), the lid member (5, 6) has its lengthwise edges provided with score lines (17) for folding the edge portions (13, 14). The coffin is assembled to its operational form by making the folds at the score lines, and the lid is adapted to be connected at least along one of the end wall elements for producing the coffin (1).Linvention concerne un cercueil construit dans un matériau biodégradable et destiné en particulier au transport, à linhumation ou à la crémation danimaux de compagnie. Un objectif de linvention est de pallier certains des inconvénients de cercueils actuellement disponibles et dobtenir ainsi une structure fonctionnelle pour transporter, inhumer ou incinérer des animaux de compagnie dans un crematorium. Plus spécifiquement, linvention concerne un cercueil (1) qui est fait dun matériau de carton, dans lequel est découpée une ébauche de cercueil qui comprend un fond (2), des parois latérales (3), des parois dextrémité (4) et des extensions de paroi latérale, ainsi quun couvercle qui comprend u
