An electrical connector including a housing having first and second portions opposite to each other and provided on the second portion with an opening through which a flat circuit device is inserted in the housing along a direction extending toward the first portion and a mounting member fixed to the housing, wherein the mounting member comprises a base portion, a board connecting portion provided on the base portion to be connected with a solid circuit board which the first portion of the housing faces closely, an arm portion extending from the base portion into the housing, a locking portion provided on the arm portion for engaging with the flat circuit device inserted in the housing through the opening provided thereon to hold the same, and a manipulatable portion provided on the arm portion for protruding from the second portion of the housing to the outside of the housing, and the locking portion is operative to disengage from engagement with the flat circuit device when the manipulatable portion is manipulated under a condition wherein the locking portion is put in the engagement with the flat circuit device.