A filler delivery device is configured to place a filler inside a bulge occurring in a body lumen. The filler delivery device includes a frame member configured to be expandable and compressible, and a tubular member through which a catheter for injecting the filler into the bulge is insertable. The tubular member is provided such that, when the frame member is in an expanded state, an open end of the tubular member is directed in a direction intersecting an extending direction of the body lumen. The filler material includes a base gel having flowability with which the filler material flows inside the catheter, and shape retainability with which the filler material stays inside the bulge after being injected from the catheter into the bulge, and a solidification promoting substance that promotes solidification of blood inside the bulge.