The purpose of the present invention is to provide a belt cover as a piece of horse tack which enables a biological signal acquisition system for horses comprising a plurality of sensors and a processing device to be easily attached to and removed from the body of the horse, and which can stably acquire biological signals during various exercise states of a horse ranging from gentle activity such as standing still and resting to rigorous activity such as running at full speed. The present invention pertains to a cover for a belt worn on the body of a horse, wherein the belt cover is characterized by being equipped with at least (1) a horse body surface–contacting electrode that is for detecting bioelectric signals and comprises a stretchable conductor including silver particle–containing conductive particles and a binder resin and having a sheet resistance of no more than 0.1 Ω□, (2) an electric wire that comprises a stretchable conductor including silver particle–containing conductive particles and a binder resin and having a sheet resistance of no more than 0.1 Ω□, and (3) a connector that connects to the electric wire, and is characterized in that an insulating layer is laminated upon the electric wire, and the horse body surface–contacting electrode and the electric wire are seamlessly integrated together.L'objet de la présente invention est de fournir une housse de courroie en tant que pièce de harnachement de cheval qui permet qu'un système d'acquisition de signaux biologiques pour chevaux comprenant une pluralité de capteurs et un dispositif de traitement soient facilement attachés au corps du cheval et retirés de celui-ci, et qui peut acquérir de manière stable des signaux biologiques pendant divers états d'exercice d'un cheval, allant d'une activité douce telle que la position immobile et le repos, à une activité énergique telle qu'une course à grande vitesse. La présente invention concerne une housse pour une courroie portée sur le corps d'un cheval, la ho
