To provide a stretchable capacitor that shows a 1:1 relationship between degree of stretching and capacitance and has high sensitivity and no hysteresis, and to apply the same to a respiration sensor or sensing wear. Provided is a capacitor having a layered structure in which at least a stretchable conductor layer, a stretchable dielectric layer, and a stretchable conductor layer are stacked in that order, wherein the stretchable capacitor is obtained by using: the stretchable conductor layers that are a composition containing metal particles and that is characterized in that the specific resistance when not stretched is 3 *10 -3 [Omega]cm or less and the specific resistance when 100% stretched is no greater than 100 times the specific resistance when not stretched； and a stretchable dielectric layer with little inorganic constituents, preferably with a Poisson ratio of at least 0.28. The obtained stretchable capacitor can be attached to a belt, shirt, or the like and is capable of sensing respiration on the basis of changes in a sleeveless garment. Moreover, if the stretchable capacitor is placed in an indirect location or the like of clothing, the motion of the wearer can be read.本發明提供一種伸張度與靜電電容顯示1：1之對應，高感度且無遲滯的伸縮性電容器，該伸縮性電容器適用於呼吸感測器、感測衣。使用伸縮性導體層與無機成分少，較佳為帕松比為0.28以上之伸縮性介電體層，獲得一種伸縮性電容器，該伸縮性電容器至少具有按順序疊層了伸縮性導體層、伸縮性介電體層、伸縮性導體層而成之層結構，該伸縮性導體層係含有金屬粒子之組成物，其特徵為：非伸張時之電阻率為3×10-3Ωcm以下，100%伸張時之電阻率為非伸張時之100倍以內。可將獲得之伸縮性電容器安裝於帶、襯衫等，並利用衣飾的變化進行呼吸感測。又，若配置在衣類之關節部位等，可讀取穿戴者的活動。
