The present invention relates to a comb plate which includes a detection line installed in a single continuous line in order to detect the breakage of teeth of the comb plate fixed at the front of a landing plate of an escalator, thereby being capable of observing the breakage status of all teeth and having a simple configuration for the detection, and which uses only a single detection line while observing all of a plurality of teeth provided in the comb plate, thereby minimizing the cost for observing the teeth.