Soft and highly flexible electrodes were fabricated from the natural rubber latex and ionic fillers by UV curing. The eggshell was utilized here as the calcium source as the CaCl2 bio-filler. The fabricated electrodes possessed many advantages: softness, flexibility, smoothness, compliance, and various desired physical properties. The tensile strength, tensile strain, electrical conductivity, and critical strain of the soft compliant electrode with the 5.8%v/v eggshell CaCl2 added were 1.28 MPa, 34%, 0.13 S/cm, and 41%, respectively. The obtained electrical conductivity value of natural rubber composite film added with 5.8%v/v eggshell CaCl2 was substantially higher than those of the cured and uncured natural rubber composite films without adding a filler by 5 orders of magnitudes. The soft compliant electrode produced from the eggshell CaCl2 is shown here as a potential candidate material for various electronic applications.