In 5G/ Beyond 5G (B5G) wireless networks, one of the key challenge is maintaining reliable and stable connectivity while accommodating user mobility. Therefore, handover management is very important for ensuring seamless connectivity in order that services can be provided without interruption. Compared with previous generations, the handover procedure should be considered not only between different base stations or radio access technologies but also between different Network Slices (NSs). In this paper, we propose a Fuzzy-based system for handover management considering four NS parameters: Slice Load (SL), Slice Stability (SS), Slice Delay (SD), and Slice Monetary Cost (SMC), which is a new parameter. The simulation results indicate that these parameters have different impacts on Handover Decision (HD). The increase of SL, SD, and SMC values increases the HD parameter, while the increase of SS leads to a decrease in HD value.