Fossil fuel is the most important energy resources for human life whilst its production tend to decrease in recent year, hence it is needed an alternative renewable energy resources for replacement. Many researches were developed to investigate an alternative energy resource. The conversion of biomass to bio oil is one of the prospective alternative energy resources. This research used palm solid wastes from palm oil industry which consist of tree, stem and empty bunch as a sample material. Pyrolysis is a method selected. The process was conducted in a stainless steel tube reactor having diameter and length of 3.81 and 60 cm respectively, at temperature range of 450-600°C under flow of nitrogen. The best result of 58.75 % bio oil is achieved at run 600°C for the sample of the tree having diameter of -2+6 mesh. Analysis of the product conducted using a gas chromatograph HP 5890 II. Many compounds such as ethanol, benzene, toluene and xylen were identified among the product of bio oil produced.