To provide a sound insulating structure and sound insulating members to be provided along a belt line of an automobile capable of achieving a satisfactory sound insulating effect.

In this sound insulating structure provided along a belt line L of an automobile for sound-insulating between a door panel 40 and a door glass pane 50, sound insulating members 1a, 1b are provided on either of lower end parts of an outer seal part 20 and an inner seal part 30 installed on a door panel 40 and parts of the door glass pane 50 corresponding to the lower end parts, and protrusions 3a, 3b which elastically get in contact with the sound insulating members 1a, 1b when the door glass pane 50 is closed are provided on the other.