An operation control system for a construction machine including an attachment and a traveling device, comprising: an operator seat which allows an operator to sit thereon; a manipulation part to which a manipulation of the operator is applied to operate the construction machine; an image taking part which takes an image of the operator; a manipulation determination part which determines, based on image information concerning the image of the operator taken by the image taking part, whether the manipulation part is manipulated by the operator; a distraction determination part which determines, based on the image information concerning the image of the operator taken by the image taking part, whether the operator is distracted; and an operation control part which suspends an operation, among operations of the construction machine, corresponding to a manipulation applied to the manipulation part in at least one of a case where the manipulation determination part determines that the manipulation part is not manipulated by the operator and a case where the distraction determination part determines that the operator is distracted; characterised by: a lock mechanism which shifts between an operation permission state of permitting an operation of the construction machine in response to a manipulation of the operator and an operation suspension state of suspending the operation of the construction machine, the operation of the construction machine being suspended regardless of a determination by the manipulation determination part and a determination by the distraction determination part when the lock mechanism is in the operation suspension state. an operator seat which allows an operator to sit thereon; a manipulation part to which a manipulation of the operator is applied to operate the construction machine; an image taking part which takes an image of the operator; a manipulation determination part which determines, based on image information concerning the image of the operator taken by the image taking part, whether the manipulation part is manipulated by the operator; a distraction determination part which determines, based on the image information concerning the image of the operator taken by the image taking part, whether the operator is distracted; and an operation control part which suspends an operation, among operations of the construction machine, corresponding to a manipulation applied to the manipulation part in at least one of a case where the manipulation determination part determines that the manipulation part is not manipulated by the operator and a case where the distraction determination part determines that the operator is distracted; characterised by: a lock mechanism which shifts between an operation permission state of permitting an operation of the construction machine in response to a manipulation of the operator and an operation suspension state of suspending the operation of the construction machine, the operation of the construction machine being suspended regardless of a determination by the manipulation determination part and a determination by the distraction determination part when the lock mechanism is in the operation suspension state.