A spout apparatus for discharging hot or cold water with reciprocal motion, comprising: a spout apparatus body; and an oscillating element, attached to the spout apparatus body, for discharging supplied hot or cold water with reciprocal motion; wherein the oscillating element comprises: a water supply passage into which hot or cold water supplied from the spout apparatus body flows; a vortex generating passage, disposed downstream of the water supply passage, including a hot or cold water collision portion which is disposed as an island at the center in the width direction of the water supply passage and arranged to block a portion of the flow path cross section, whereby the collision of a portion of hot or cold water guided from the water supply passage to the hot or cold water collision portion produces alternately oppositely circulating Karman vortexes on the downstream thereof; and a spout port passage disposed on the downstream side of the vortex generating passage, for discharging hot or cold water guided from the vortex generating passage with reciprocal motion; wherein the vortex generating passage is formed as not to expand and deform in order to prevent that the desired Karman vortex cannot be produced, even when internal pressure is raised by the supply of hot or cold water from the water supply passage; characterized in that the spout port passage is formed of a soft material capable of elastic deformation, and is attached to the spout apparatus body so that a user can manipulate and deform the spout port massage; wherein the vortex generating passage is integrally formed of the soft material capable of elastic deformation with the spout port passage and wherein a deformation limiting portion (6, 60) is provided on an outer circumferential portion of the vortex generating passage for limiting the elastic deformation of the vortex generating passage even when internal pressure is raised by the supply of hot or cold water from the water supply passage. a spout apparatus body; and an oscillating element, attached to the spout apparatus body, for discharging supplied hot or cold water with reciprocal motion; wherein the oscillating element comprises: a water supply passage into which hot or cold water supplied from the spout apparatus body flows; a vortex generating passage, disposed downstream of the water supply passage, including a hot or cold water collision portion which is disposed as an island at the center in the width direction of the water supply passage and arranged to block a portion of the flow path cross section, whereby the collision of a portion of hot or cold water guided from the water supply passage to the hot or cold water collision portion produces alternately oppositely circulating Karman vortexes on the downstream thereof; and a spout port passage disposed on the downstream side of the vortex generating passage, for discharging hot or cold water guided from the vortex generating passage with reciprocal motion; a water supply passage into which hot or cold water supplied from the spout apparatus body flows; a vortex generating passage, disposed downstream of the water supply passage, including a hot or cold water collision portion which is disposed as an island at the center in the width direction of the water supply passage and arranged to block a portion of the flow path cross section, whereby the collision of a portion of hot or cold water guided from the water supply passage to the hot or cold water collision portion produces alternately oppositely circulating Karman vortexes on the downstream thereof; and a spout port passage disposed on the downstream side of the vortex generating passage, for discharging hot or cold water guided from the vortex generating passage with reciprocal motion; characterized in that the spout port passage is formed of a soft material capable of elastic deformation, and is attached to the spout apparatus body so that a user can manipulate and deform the spout port massage; wherein the vortex generating passage is integrally formed of the soft material capable of elastic deformation with the spout port passage and wherein a deformation limiting portion (6, 60) is provided on an outer circumferential portion of the vortex generating passage for limiting the elastic deformation of the vortex generating passage even when internal pressure is raised by the supply of hot or cold water from the water supply passage.