Electrical connection device

An electrical connection device comprising:

• a receptacle connector comprising:
• a receptacle housing having a bottom surface, a top surface opposite to the bottom surface and multiple terminal groove groups, each terminal groove group comprising a receiving groove which is recessed from the bottom surface and terminal grooves which are communicated with the receiving groove and extend toward the top surface, a groove wall defining each terminal groove comprising a first side wall portion and a second side wall portion which face each other and a top wall portion which extends from the first side wall portion toward the second side wall portion, and the top wall portion and the second side wall portion being spaced apart from each other to allow the terminal groove to form an insertion opening portion exposed on the top surface, and
• multiple terminal blocks respectively provided in the multiple terminal groove groups, each terminal block comprising an insulative base and receptacle terminals, the insulative base being provided to the receiving groove of the corresponding terminal groove group, each receptacle terminal being provided corresponding to one of the terminal grooves and having a fixed segment which is fixed to the insulative base and is close to the first side wall portion, an elastic segment which extends obliquely and upwardly from a top end of the fixed segment, then is folded back and extends obliquely and upwardly toward the top wall portion to a tip end of the elastic segment, and a tail segment which extends from a bottom end of the fixed segment toward the second side wall portion, the tip end of the elastic segment being positioned below the top wall portion, the elastic segment having a contact portion which is formed at a position where the elastic segment is folded back and presses against the second side wall portion and a guiding surface which is positioned between the contact portion and the tip end of the elastic segment and is positioned below the insertion opening portion.