A top binding band includes a connection binding band provided with a connection wire, and an elastic adjustable binding band below the connection binding band, wherein the connection binding band electrically connects, through the connection wire, a front-end member and a rear-end member of the head-mounted apparatus. The connection binding band can realize electrical connection between the front and rear members of the head-mounted apparatus. The adjustable binding band is located at the lower side and firstly comes into contact with the head to realize elastic support, thereby preventing the connection binding band with the fixed length and having the connection wire from being pulled, so as to enable the electrical connection to be safer and more reliable.