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 [Omega]□, (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 [Omega]□, 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.本發明旨在提供一種作為馬具的皮帶外罩，可將包含多個感測器、處理裝置之馬的生物體訊號取得系統簡易地設置於馬身體並可簡易地拆卸，且可在從如靜止、安靜之平穩的活動到如全力快跑之劇烈活動的各種馬的運動狀態下穩定地取得生物體訊號。 本發明關於一種皮帶外罩，係用於裝設在馬身體之皮帶的外罩，至少具備：(1)用於檢測生物體電訊號的馬身體表面接觸型電極，由包括含有銀粒子之導電性粒子與黏結劑樹脂，且片電阻為0.1Ω□以下之伸縮性導體構成；(2)電氣配線，由包括含有銀粒子之導電性粒子與黏結劑樹脂，且片電阻為0.1Ω□以下之伸縮性導體構成；及(3)與該電氣配線連接的連接器；該電氣配線上疊層有絕緣層，且該馬身體表面接觸型電極與該電氣配線無接縫地形成一體化。
