A variety of welfare policies and regulations for the elderly have been proposed to respond to an aging society. These are understood as more developed version than before because they have been established on a social consensus on the welfare for the elderly. However, the level of welfare is still stagnating at the rudiments for basic protections; so we have long way to go to fulfill sophisticated policies for the elderly`s better life. This article aims to support legal institutions for realizing lawyer`s service for the elderly in an elevated fashion. Particularly, by organizing regulations on lawyer`s professional conducts for the benefit of the elderly, protections for the elderly as increasing customers of legal services can be elevated. The article deals with the lawyer`s ethics codes for elder law practices with the elder clients with diminished capacities. In addition, conflicts of interest is reviewed when the elder client asks a lawyer to represent his or her family together with himself or herself. All these items are discussed on the premise that lawyer`s ethics should be regulated by written codes rather than individual morality.