This study aims to analyze the impact of fundamental and technical factors on firm value with investment decisions as a mediating variable. The samples were 12 companies at agricultural sector in the Indonesia Stock Exchange. The results show that leverage had a negative and significant effect on investment decisions and firm value. Profitability and trading volume had a positive and significant effect on investment decisions and firm value. Previous stock prices did not have any significant effect on investment decisions but a positive and significant effect on firm value. Investment decisions had a positive and significant effect on firm value. Leverage had a negative and significant effect on firm value through investment decisions. Profitability and stock trading volume had a positive and significant effect on firm value through investment decisions. Previous stock prices did not have any significant effect on firm value through investment decisions.