What is Kant's answer to the question about the relationship between moral life and happy life? I start with the supposition that there are two opposing views on Kant's position of this question. One is the view that Kant's ethics concerns duty alone, and happiness has no significant weight or role thereat. The other is the view that happiness and morality have a certain explicit or intimate connection in his ethics. The former view is closer than the latter to the orthodox interpretation of his ethics. In this paper I shall attempt to critically examine various arguments proposed by the proponents of the latter view. In this examination, I shall look into the three aspects of happiness: (1) happiness as a conditional good, (2) happiness as an indirect duty, (3) happiness as a constitutive element of the highest good. Recently a few scholars make a suggestion that in any of these three aspects Kant recognized a considerably clear connection between happiness and morality. This suggestion seems to be surrounded by many counterevidences more than the evidences that might support it. But if we understand that the tension between moral life and happy life is a permanent problem to be dealt with by ethicists, the possibility of the view that a clear connection between happiness and morality can be found in Kant's ethics may endow a yet richer meaning to Kant's Ethics.