shape as shown in fig1 a to 10 c in this case the spherical shape can surely prevent leakage since degree of adhesion between the superposed sheets 5 becomes higher as mentioned above it is noted here that as to shape of the downstream part any of those shown in fig8 a to 8 e may be used further the downstream part 26 may not only be curved as mentioned above but may be curled as shown in fig9 a be bent as shown in fig9 b or be clamped at its tip end by a clamping device as shown in fig9 c further as a method of fitting nozzle 1 to container body 2 there may be used a method of inserting the nozzle 1 into discharge port 29 of the container body as shown in fig2 a a method of inserting the nozzle 1 onto an exterior of the discharge port 29 as shown in fig2 b and a method of screwing the nozzle onto the discharge port as shown in fig2 c further the nozzle 1 may be integrally welded to the container body 2 as in the above mentioned embodiments fig2 a and 26 b are views which show a configuration of another embodiment of the present invention in this configuration three sheets 5.