[2026 Latest] How Does the Rakuten Search Algorithm Work? Fundamentals of "Sales" and "Relevance" for Beginners

Understanding the "search algorithm" is essential for maximizing product exposure on Rakuten Ichiba. Especially for new staff members recently assigned to EC operations, it can be difficult to know where to start. Unlike general search engines such as Google, Rakuten's algorithm is heavily optimized for "maximizing sales within Rakuten Ichiba." Based on the latest trends as of 2026, this article provides a clear explanation of the mechanisms behind "sales performance" and "search relevance," which form the core of the algorithm.

A conceptual data visualization showing search ranking factors such as sales volume, conversion rates, and keyword relevance scores on a digital dashboard interface.

1. Why "Sales" is the Top Priority of the Rakuten Algorithm

In the Rakuten search algorithm, the most influential factor is "recent sales performance." As a platform, Rakuten Ichiba aims to maximize the Gross Merchandise Value (GMV) of the entire mall by displaying products that users are most likely to purchase at the top of search results. Specifically, the sales amount, number of units sold, and conversion rate (CVR) over the past few days to weeks are the primary factors for scoring.

Q. Will my search ranking not improve without using ads (RPP)?
A. While it is not mandatory, for new products or cases where there is zero 'sales history,' building a track record through advertising is the most efficient way to improve search rankings.
Q. Is it better to have as many reviews as possible?
A. While quantity is important, the "freshness" of reviews within the last three months and the average star rating (aiming for 4.0 or higher) have a more significant impact on the algorithm.

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Summary

Mastering the Rakuten search algorithm begins with two pillars: "building a sales track record" and "meticulous metadata design." New managers should observe the correlation between daily sales data and search rankings to develop the ability to identify which keywords are the "winning path" for their store. While algorithms are constantly evolving, the core principle of "delivering valuable products to users" remains unchanged.

Published: May 14, 2026 / By: Risa Watanabe

WRITTEN BY
Risa Watanabe

Risa Watanabe

Senior Consultant

Meets Consulting Inc.

References

  • [1] Rakuten Ichiba Search Guidelines (within Shop Management Navi)
  • [2] 2026 EC Mall Search Algorithm Trend Research Report
Disclaimer: This article is for informational purposes only and is not intended as a substitute for professional advice. It does not guarantee specific results.