This study considers firms�� coarse information about a worker��s possible types in Spence��s (1973) job market signaling model. Using incentive compatibility constraints appropriate to coarse information, we derive perfect Bayesian equilibria, which are refined into a unique equilibrium by invoking an extension of Cho and Kreps�� (1987) Intuitive Criterion. In the unique refined equilibrium, a high-type worker may acquire a higher education level with a lower wage than in Spence��s (1973) model. This implies that education signaling may be less effective signal when firms have coarse information about a worker��s possible types compared to that in Spence (1973).