The present invention relates to a kit and nucleic acid chip for diagnosing bladder cancer using a bladder cancer-specific marker gene. More particularly, the invention relates to a kit and nucleic acid chip for diagnosing bladder cancer, which can detect the promoter methylation of a bladder cancer-specific gene, the promoter or exon region of which is methylated specifically in transformed cells of bladder cancer. The use of the diagnostic kit or nucleic acid chip of the invention enables diagnosis of bladder cancer at an early stage of transformation, thus enabling early diagnosis of bladder cancer, and can diagnose bladder cancer in a more accurate and rapid manner compared to a conventional method.