Protection device for a zone (P), against terrestrial gastropods, comprising at least one barrier that includes: a socket (12, 22, 32, 512, 612) intended to be attached to the periphery of the zone (P) to be protected and a ceiling wall (13, 23, 33, 53) spliced to said base (12, 22, 32, 512, 612), characterized in that it also comprises； a grid (14, 24, 34a, 34b) that extends along the ceiling wall (13, 23, 33, 53) and at a distance from it, a space (15, 25, 35, 35a, 35b, 65) between said roof wall and the grid and at least one barricade means located in said space, in which the socket (12, 22, 32, 512, 612) and the roof wall (13, 23, 33, 53) have non-existent interstices or small enough to prevent gastropods of a size category whose purpose is the barrier (11, 21, 31, 31a, 31b, 41, 51, 61) to pass through it, in the one that the grid (14, 24, 34a, 34b) has a hitch surface insufficient enough to prevent said gastropods from snagging there and in which the barricade means or means form an obstacle to the routing of said gastropods in said space (15, 25, 35, 35a, 35b, 65).Dispositivo de protección de una zona (P), contra unos gasterópodos terrestres, que comprende al menos una barrera que incluye: un zócalo (12, 22, 32, 512, 612) destinado a estar sujeto a la periferia de la zona (P) que hay que proteger y una pared de techo (13, 23, 33, 53) empalmada a dicho zócalo (12, 22, 32, 512, 612), caracterizado por que comprende, además； una rejilla (14, 24, 34a, 34b) que se extiende a lo largo de la pared de techo (13, 23, 33, 53) y a una distancia de esta, un espacio (15, 25, 35, 35a, 35b, 65) entre dicha pared de techo y la rejilla y al menos un medio de barricada situado en dicho espacio, en el que el zócalo (12, 22, 32, 512, 612) y la pared de techo (13, 23, 33, 53) presentan unos intersticios inexistentes o lo suficientemente pequeños como para impedir que unos gasterópodos de una categoría de tamaños que tiene como propósito la barrera (11, 21, 31, 31a, 31b, 41, 51, 61
