Wilson Sonsini Goodrich & Rosati
Professional Corporation 650 Page Mill Road
Palo Alto, California 94304-1050 o: 650.493.9300
f: 650.493.6811

Exhibit 5.1

March 29, 2023

BioCardia, Inc.
320 Soquel Way
Sunnyvale, California 94085

Re: Registration Statement on Form S-8

Ladies and Gentlemen:

We have examined the Registration Statement on Form S-8 (the “Registration Statement”) to be filed by BioCardia, Inc., a Delaware corporation, with the Securities and Exchange Commission on or about the date hereof, in connection with the registration under the Securities Act of 1933, as amended, of 803,070 shares of your common stock, par value $0.001 per share (the “Shares”), reserved for issuance pursuant to the 2016 Equity Incentive Plan, as amended (the “Plan”). On the basis of the foregoing, and reliance thereon, we are of the opinion that the Shares, when issued and sold in the manner referred to in the Plan and pursuant to the agreements that accompany the Plan, will be legally and validly issued, fully paid and nonassessable.

We consent to the use of this opinion as an exhibit to the Registration Statement, and further consent to the use of our name wherever appearing in the Registration Statement and any amendments thereto.

Sincerely,

/s/ Wilson Sonsini Goodrich & Rosati

WILSON SONSINI GOODRICH & ROSATI

Professional Corporation

AUSTIN        BEIJING        BOSTON        BRUSSELS        HONG KONG        LONDON        LOS ANGELES        NEW YORK        PALO ALTO
SAN DIEGO        SAN FRANCISCO        SEATTLE        SHANGHAI        WASHINGTON, DC        WILMINGTON, DE