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We report on the superconducting gap and pairing symmetry in layeredsuperconductor Bi4O4S3. The measurement of temperature dependence of magneticpenetration depth was carried out using tunnel diode oscillator technique. Itis observed that Bi4O4S3 is a conventional s-wave type superconductor withfully developed gap. The zero-temperature value of the superconducting energygap {\Delta}0 was found to be 1.54 meV, corresponding to the ratio2{\Delta}0/kBTc=7.2 which is much higher than the BCS value of 3.53. In thesuperconducting range, superfluid density is very well described by single gaps- wave model.

Evidence for Fully Gapped Strong Coupling S-wave Superconductivity in Bi4O4S3