A pouring spout for a refill container in which contents for refilling the contents of a packaging container are stored, the pouring spout comprising: a tubular pouring part; an attached part attachable to the refill container on one end side of the tubular pouring part in an axial direction; and a closing member for closing the one end side of the tubular pouring part, configured as a separate body from a spout main body of the pouring spout, and fitted onto an inner circumferential surface of the tubular pouring part on the one end side thereof in such a manner that the closing member is removed by an external force applied from the other end side opposite to the one end side in the axial direction from the inner circumferential surface of the tubular pouring part; characterised in that: the closing member is connected by a coupling member to the spout main body; the coupling member is made of a resin and has a string shape or a strip shape, wherein one end of the coupling member in the longitudinal direction is coupled to a lower end surface of the attached part of the spout main body at a position slightly shifted to the outer side in a radial direction from a peripheral part of a channel of the pouring spout; the other end of the coupling member in the longitudinal direction is coupled to a lower surface of the closing member, which is a surface of the closing member that is arranged to face an interior of the refill container when the pouring spout is attached to the refill container in a mode in which the closing member is fitted into the channel of the pouring spout; the coupling member couples the closing member and the attached part of the spout main body in such a manner that a force is applied in a direction in which the closing member is separated from the channel of the pouring spout. a tubular pouring part; an attached part attachable to the refill container on one end side of the tubular pouring part in an axial direction; and a closing member for closing the one end side of the tubular pouring part, configured as a separate body from a spout main body of the pouring spout, and fitted onto an inner circumferential surface of the tubular pouring part on the one end side thereof in such a manner that the closing member is removed by an external force applied from the other end side opposite to the one end side in the axial direction from the inner circumferential surface of the tubular pouring part; characterised in that: the closing member is connected by a coupling member to the spout main body; the coupling member is made of a resin and has a string shape or a strip shape, wherein one end of the coupling member in the longitudinal direction is coupled to a lower end surface of the attached part of the spout main body at a position slightly shifted to the outer side in a radial direction from a peripheral part of a channel of the pouring spout; the other end of the coupling member in the longitudinal direction is coupled to a lower surface of the closing member, which is a surface of the closing member that is arranged to face an interior of the refill container when the pouring spout is attached to the refill container in a mode in which the closing member is fitted into the channel of the pouring spout; the coupling member couples the closing member and the attached part of the spout main body in such a manner that a force is applied in a direction in which the closing member is separated from the channel of the pouring spout. the closing member is connected by a coupling member to the spout main body; the coupling member is made of a resin and has a string shape or a strip shape, wherein one end of the coupling member in the longitudinal direction is coupled to a lower end surface of the attached part of the spout main body at a position slightly shifted to the outer side in a radial direction from a peripheral part of a channel of the pouring spout; the other end of the coupling member in the longitudinal direction is coupled to a lower surface of the closing member, which is a surface of the closing member that is arranged to face an interior of the refill container when the pouring spout is attached to the refill container in a mode in which the closing member is fitted into the channel of the pouring spout; the coupling member couples the closing member and the attached part of the spout main body in such a manner that a force is applied in a direction in which the closing member is separated from the channel of the pouring spout.