A semiconductor integrated circuit device includes at least one first transistor configured to control conductance between an input power line and an output power line, at least one second transistor configured to control conductance between the input power line and the output power line, a first buffer configured to supply a first control signal for driving the at least one first transistor to a first control line connected to the at least one first transistor, a second buffer configured to generate a second control signal for driving the at least one second transistor upon receipt of the first control signal supplied through the first control line and supply the second control signal to a second control line connected to the at least one second transistor, and at least one capacitor connected between the first control line and the output power line.