Monopolar cannula for anaesthesia, with a metal cannula tube (10), with an attachment (12) made of an electrically insulating plastic mounted at the proximal end of the cannula tube (10), with a connector piece arranged on the attachment (12) for the purpose of introducing a liquid into the cannula tube (10), and with a stimulation cable (24) which, with an electrically conducting wire, electrically contacts the cannula tube (10) in the region of the attachment (12), wherein the stimulation cable (24) can be laterally secured on the attachment (12) by a securing part (26) made of an electrically insulating plastic, wherein the securing part (26) has an electrically conductive contact part (38) connected to the wire, and wherein the contact part (38) engages in a recess (16) of the attachment (12) and contacts the cannula tube (10) when the securing part (26) is secured on the attachment (12).
