To provide a premise protective relay device capable of preventing unwanted disconnection caused by a loop tidal current in a power receiving loop switching operation.

When a phase increase component Δθ of a present current I₍₀₎ inputted from an A/D converter 11 with respect to a T-cycle-before current I_(-T) inputted from a retarder 12 is settled within a non-operation zone of 0°±40° or within a non-operation zone of 180°±40°, a phase comparator 14 outputs a low-level output signal. When the phase increase component Δθ of the present current I₍₀₎ with respect to the T-cycle-before current I_(-T) is settled within any other operation zone than these two non-operation zones, the phase comparator 14 outputs a high-level output signal. When high-level output signals are inputted from a current value comparator 13 and the phase comparator 14 and high-level first and second counter-side power transmission line protective relay device non-operation signals S_Ry1 and S_Ry2 are inputted from first and second counter-side power transmission line protective relay devices, an AND circuit 15 outputs a trip signal TR.