仕組みと動作原理
VLOOKUP関数はExcel業務を効率化する代表的な関数です。表の左端の列で値を検索し、同じ行の指定した列にある値を返します。 複雑な集計や参照処理を簡素化し、データ分析の精度と生産性を飛躍的に高めます。
💡 わかりやすい要約
Searches down the first column of a table to find a matching word, then reads across that row to get a value from a column you choose.
"Think of VLOOKUP like sliding your finger down a price catalog. You lookup the item name in the left column, then slide your finger to the right to see the price."
構文.
標準Excel表記法=VLOOKUP(検索値, 範囲, 列番号, [検索方法])引数一覧.
この関数で指定できるすべての引数について詳しく解説します。
The value to search for in the first column of the table.
指定例:D2The range containing the search column and the return column.
指定例:A2:B6The column number in the table range to return a value from (first column is 1).
指定例:2TRUE = Approximate match, FALSE = Exact match. In almost all cases, set to FALSE.
初期値: FALSE具体的な計算例
ステップ別の実務シナリオProduct Pricing Directory
Retrieve a product's price using its exact name.
| Item Name | Price | Stock | Query Item | Item Cost |
|---|---|---|---|---|
| Laptop | 999 | 15 | Tablet | — |
| Monitor | 299 | 8 | — | — |
| Tablet | 449 | 24 | — | — |
=VLOOKUP(D2, A2:B6, 2, FALSE)Evaluates VLOOKUP over the sample table cells, placing the verified output in cell E2.
数式ジェネレーター
ウィザードを開く引数を入力するだけで、シートにそのまま貼り付けて使える数式を作成できます。
=VLOOKUP()出力される値の特性
Returns "Engineering" based on sample evaluation criteria and active cell references.
実務上のベストプラクティス
- Always set range_lookup to FALSE or 0 to avoid incorrect approximate match returns.
- Lock your table_array range with dollar signs (e.g. $A$2:$C$6) when copying formulas down a column.
よくあるミスと注意点
- VLOOKUP can only search from left to right. The lookup value must always be in the first column of the table_array.
- Inserting or deleting columns in the table range shifts the column indices, which breaks VLOOKUP or returns incorrect data.
各プラットフォーム対応表
実際のExcelおよびGoogleスプレッドシートの計算エンジン仕様に基づいた検証結果です。
Core standard function supported across all modern and legacy Microsoft Excel versions (365, 2021, 2019, 2016, 2013, 2010), as well as Excel for the Web and Mac.
100% compatible with Google Sheets. Uses identical argument order, data types, and standard calculation logic.
よくある質問と回答
技術解説Why is VLOOKUP returning a #N/A error?↓
The #N/A error means the lookup_value was not found in the first column of table_array. Common causes include trailing or leading spaces in cell text, numbers stored as text strings, or omitted range_lookup causing false misses.
Can VLOOKUP look to the left in Excel?↓
No. Traditional VLOOKUP can only search the leftmost column of the table_array and return values to the right. To look up data to the left, use XLOOKUP or an INDEX and MATCH formula combination.
Why should I always specify FALSE as the fourth argument in VLOOKUP?↓
Omitting the fourth argument defaults VLOOKUP to TRUE (approximate match), which assumes your table is sorted alphabetically or numerically. Setting range_lookup to FALSE or 0 guarantees an exact match.