applied to the upper surface of the support plug 13 in the next step an annular layer of solder 5a is deposited on the bottom 7b of the housing 7 and the capacitor element 1 with the electrodes 4 and 5 already mounted on the disc 2 is fitted into the upper opening 10 of the housing 7 and placed on the layer of solder 5a subsequently the central conductor member 6 is inserted into the central bore 3 of the disc 2 and its collar 6a is placed on a ring of solder 4a located on electrode 4 the through type capacitor c thus assembled is then passed through a conveyor furnace not shown which is at a predetermined temperature to fuse the solder rings 4a and 5a securing the collar portion 6a of the central conductor member 6 to the electrode 4 and the electrode 5 to the bottom 7b of the housing 7 finally the resin material 9 is inserted into the space in the upper opening 10 of the housing 7 and also if it is necessary to improve the protection against humidity into the mouths s of the spaces between the wall 7c defining the lower opening 12 and support plug 13 and between the central conductor member 6 and the central bore 13 0 of the support plug 13 it is to be noted here that in the.