Consent of Independent Certified Public Accountants
We have issued our report dated October 13, 2000 accompanying the
financial statements of Insured Municipals Income Trust, Series 178 as of August
31, 2000, and for the period then ended, contained in this Post-Effective
Amendment No. 15 to Form S-6.
We consent to the use of the aforementioned report in the Post-
Effective Amendment and to the use of our name as it appears under the caption
"Auditors".
Grant Thornton LLP
Chicago, Illinois
December 22, 2000
