Quantum vacuum effects are investigated for the electromagnetic field, induced by a conducting cylindrical shell in background of (D+1)dimensional de Sitter spacetime. We assume that the field is prepared in the Bunch-Davies vacuum state. A complete set of the electromagnetic field mode functions is determined. By using these mode functions, the vacuum expectation value
(VEV) of the electric field squared is evaluated for both exterior and interior regions. The VEV is decomposed into the boundary-free and boundary-induced contributions. The behavior of the latter is investigated in various asymptotic regions of the parameters. For D=3 the boundary-induced VEV is related to the corresponding result for a cylindrical shell in Minkowski spacetime by standard conformal relation.