본 연구는 베이비부머를 동질집단으로 간주한 기존의 소득불평등 관련 연구의 한계를 지적하고, 계급을 구분하여 근로소득 격차와 불평등 변화 추이를 규명하고자 하였다. 이를 위해 한국노동패널조사 1차, 5차, 10차, 15차년도 자료를 이용하였으며, 지니계수와 일반화된 엔트로피지수로 베이비부머의 근로소득 불평등을 측정하고 불평등 추세를 분해하였다. 분석결과, 첫째, 계급간 근로소득에서 많은 차이를 보여 베이비부머는 경제적 수준에서 동질적인 집단으로 볼 수 없는 것으로 나타났다. 둘째, 계급 간 근로소득 격차도 심하지만, 계급 내 성별에 따른 근로소득 격차와 동일 성별 내 근로소득 격차도 크다. 셋째, 우리나라 베이비부머의 소득불평등은 증가하고 있으며, 베이비부머내 소득양극화가 심각해지고 있었다. 넷째, 베이비부머 계급내 불평등은 노년기 진입시점이 가까워질수록 심화되는 경향을 보였다. 본 연구는 베이비부머를 계급으로 구분함으로써 계급간 근로소득 격차, 그리고 계급내 소득불평등을 실증적으로 입증할 수 있었다. 이러한 결과를 토대로 베이비부머내 계급과 성별 등 이질적인 요소들을 고려한 노후 소득보장 및 노동시장정책에서의 개선방안을 제시하였다. This purpose of this study is to analyzes the patterns and changing factors of economic gap and income inequality in Korea baby boomers, focusing on the effect of heterogeneity among baby boomers. In order to do this, distinguished the types of class in to six groups that “professional manager class”, “sales/service class”, “petty self-employment class” “farmer class”, “skilled working class”, “unskilled working class”, estimate earned income gap, pattern of earned income inequality depending on the class. Data come from Korean Labor and Income Panel Study(KLIPS) 1st, 5th, 10th, 15th wave. Income inequality is measured by the Gini coefficient and generalized entropy indices and decomposed inequality trend. The results are as follows. Firstly, income inequality of baby boomer is high and the earning polarization within class in baby boomer has become more serious in Korea. Secondly, the occupation class at the earned income level has a significant effect on the income differentials. Thirdly, a transition to old age is associated with an increase in income inequality. The gini index and generalized entropy indices increased steadily over the period analysis. Based on the research results, the following policy implications can be drawn. First, various policy supports are needed to increase the income of the low level class(especially, farmer class and unskilled working class) in order to continue alleviation of the income inequality. Second, social security system need to be reformed for baby boomers in poverty or labour market vulnerable classes. Moreover, vocational training and retirement planning programs for low level classes and specialized policy should be implemented to give incentive to the low level in low income class earn greater income so that they can break away from low income. Public policies for human resource management and job creations could lead them to get decent jobs.