The effect of hydrostatic pressure on the electrical conductivity of a TlInSe2 single crystal along the tetragonal axis [001] is studied in the range from 0 to 14 × 106 kPa. It is revealed that in this case the dependence of electrical conductivity on pressure follows the law: σ(P) =σ(0) e−GP/2kT which holds true for cases of linear narrowing of the band gap with pressure. It is found that the pressure coefficient of the band gap G = ∂Eg(P)/∂P responsible for the change in the electrical conductivity with pressure amounts to G = (∂ In σ(P)/∂P) 2kT = −1.75 × 10−10eV/Pa which coincides in the order of magnitude with the coefficient G[001] = −(3 to 4) × 10−10 eV/Pa characterizing the narrowing (widening) of the indirect energy gap for a uniaxial compression (expansion) of the given crystals along [001].

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